Ontario Highway 401

Highway 401
Macdonald–Cartier Freeway Highway of Heroes
Highway 401 (in red) within Southern Ontario.
Route information
Maintained by Ministry of Transportation of Ontario
Length:	816.6 km[2][note 1] (507.4 mi)
History:	Proposed 1938 Opened December 1947 – October 11, 1968[1]
Major junctions
West end:	Highway 3 – Windsor
	Highway 402 – London  Highway 403 – Woodstock Highway 407 near Milton  Highway 403 /  Highway 410 – Mississauga  Highway 427  Highway 409  Highway 400 Allen Road  Highway 404 / Don Valley Parkway – Toronto  Highway 416 near Prescott
East end:	A-20 towards Montreal, QC
Location
Major cities:	Windsor, London, Kitchener, Mississauga, Toronto, Oshawa, Kingston
Highway system
Ontario provincial highways 400-series • Former ← Highway 400 Highway 402 →

King's Highway 401, also known by its official name as the Macdonald–Cartier Freeway and colloquially as the four-oh-one,^[3] is a 400-Series Highway in the Canadian province of Ontario stretching from Windsor to the Quebec border. The segment of Highway 401 passing through Toronto is the busiest road in North America,^[4] and one of the widest and busiest in the world.^[5][6] Together with Quebec Autoroute 20, it forms the transportation backbone of the Quebec City – Windsor Corridor, along which over half of Canada's population resides. The entire route is maintained by the Ministry of Transportation of Ontario (MTO) and patrolled by the Ontario Provincial Police. The posted speed limit is 100 km/h (62 mph) throughout its length.

Three highways were renumbered "Highway 401" in 1952: the Toronto Bypass between Weston Road and Highway 11 (Yonge Street); Highway 2A between West Hill and Newcastle; and the Scenic Highway between Gananoque and Brockville, now known as the Thousand Islands Parkway. These three sections of highway were 11.8 km (7.3 mi), 54.7 km (34.0 mi) and 41.2 km (25.6 mi) long, respectively, at the time of their assumption. It became fully navigable from Windsor to the Quebec border in 1964. In 1965, the highway was given a second designation, the Macdonald–Cartier Freeway, in honour of the fathers of Confederation. By the end of 1968, the Gananoque–Brockville section was bypassed and the final intersection grade-separated near Kingston, making Highway 401 a freeway for its entire 816 km (507 mi) length. On August 24, 2007, the portion of the highway between Trenton and the Don Valley Parkway in Toronto was designated the Highway of Heroes, as the road is travelled by fallen Canadian servicemen and women from the Canadian Forces Base to the coroner's office in Toronto.

Route description

Highway 401 near it's western terminus in Windsor.

Highway 401 extends across Southwestern, Central and Eastern Ontario. In foresight of the future expansion of the highway, the planners purchased a 91.4 m (300 ft) right-of-way along the entire length. Generally the highway occupies only a portion of this allotment.^[7] It is one of the world's busiest highways;^[5] a 2006 report stated that the annual average daily traffic (AADT) count between Weston Road and Highway 400 in Toronto was estimated at 431,900,^[2] with up to 500,000 vehicles passing over it on some days.^[4] This makes it the busiest roadway in North America, surpassing the Santa Monica Freeway in Los Angeles, Interstate 10 (I-10) in Houston and I-75 in Atlanta.^[8] The just-in-time auto parts delivery systems of the highly integrated auto industry of Michigan and Ontario have contributed to the highway's status as the busiest truck route in the world,^[9] carrying 60% of vehicular trade between Canada and the US.^[8]

Highway 401 also features the busiest multi-structure bridge in North America, located at Hogg's Hollow in Toronto.^[9] The four bridges, two for each direction with the collector and express lanes, carried an average of 373,700 vehicles daily in 2006.^[2] The highway is one of the major backbones of a network in the Great Lakes region, connecting the populous Quebec City – Windsor corridor with Michigan, New York, and central Ontario's cottage country.^[10] It is the principal connection between Toronto and Montreal, becoming Autoroute 20 at the Quebec border.^[11]

In the first quarter of 2007, Bill 203, the Safer Roads for a Safer Ontario Act was introduced to parliament by ERASE (Eliminate Racing Activities on Streets Everywhere), a campaign created by local and provincial police.^[12][13] The law, passed September 30, 2007, allows police to immediately suspend the driver’s licence and impound the vehicle involved for seven days in the case of "excessive speeding" (driving 50 km/h (31 mph) over the limit, or over 150 km/h (93 mph) on 400-series highways).^[14][15] Transport truck maximum speed is also limited, by speed governors, to 105 km/h (65 mph), as in nearby Quebec.^[16]

Southwestern Ontario

The border crossing between Windsor and Detroit is the busiest trade crossing in the world.^[9] However the highway itself does not physically extend the last few kilometres to Detroit.^{[note 1][17]} A proposed Windsor–Detroit border crossing may result in Highway 401 connecting directly to the border as early as 2013.^[18] At present, Highway 401 begins at Huron Church Road (formerly Highway 3) in Windsor,^[19] with four lanes diverging north and leaving Talbot Road (Highway 3) at Howard Avenue. At Dougall Avenue, the highway veers east, widens to six lanes and exits Windsor.^[20] From here, Highway 401 mostly parallels the former route of Highway 98 from Windsor to Tilbury.^[19]

The topography in southwestern Ontario is flat, and the land use primarily agricultural, taking advantage of the fertile clay soil deposited throughout the region.^[21][22]. The primary river through the region is the Thames River, which drains the second largest watershed in southern Ontario, though several smalller creeks are interspersed throughout the region. Southwestern Ontario is also home to some of the few remaining stands of Carolinian forest.^[23]

Between London and Ingersoll Highway 401's route through the Dorchester swamp features rolling terrain.

From Tilbury, the highway loses its tall wall median barrier and narrows to four lanes, following lot lines laid between concession roads in a plan designed to limit damage to the sensitive agricultural lands through which the highway runs.^[24] Due to fatigue caused by the lack of driver engagement along the flat and straight lengths of highway,^[25] the section of Highway 401 from Windsor to London (especially west of Tilbury) has become known for deadly car accidents and pile-ups, earning it the nickname Carnage Alley.^[26] As the highway approaches London, it partially interchanges with Highway 402^[20] and widens back to six lanes.^[27][28] Within London, it intersects the city's two municipal expressways, Highbury Avenue and the Veterans Memorial Parkway.^[29]

The section between London and Woodstock generally parallels the former Highway 2 but lies on the south side of the Thames River.^[20] While the topography in this area is less flat, the highway is generally straight. To the south of Woodstock, Highway 401 curves northeast and partially interchanges with Highway 403.^[29] The highway heads towards Kitchener and Cambridge, where it encounters Highway 8 and returns to its eastward orientation.^[20][30] Some sections of Highway 401 between Woodstock and Kitchener are four lanes, but these are currently being expanded to make Highway 401 six lanes from London to Toronto.^[31] East of Kitchener, the highway travels east towards Milton, passing through the hills and cut rock along the way.^[32]

Greater Toronto Area

Highway 401 uses a collector-express roadway configuration to manage its high traffic volumes.

As Highway 401 approaches the Greater Toronto Area, it descends through the ecologically protected Niagara Escarpment to the west of Milton.^[33][34] After passing through the town, it enters the western side of Toronto's Greenbelt, a zone around Toronto protected from development.^[33] After this 10 km (6.2 mi) gap, the highway enters the first urbanized section of the GTA, passing through only a few rural areas between the cities of Mississauga and Oshawa.^[20][35]

As Highway 401 approaches the large Highway 403 / Highway 410 junction in Mississauga, it widens into a collector-express system,^[36] a concept inspired by the Dan Ryan Expressway in Chicago.^[7] The system divides each direction of travel into collector and express lanes.^[37] This gives the highway a wide span and four carriageways. To avoid confusion between carriageways, blue signs are used over the collector lanes and green signs over the express lanes. Unlike the collector lanes, which provide access to every interchange, the express lanes only provide direct access to a select few. Access between the two is provided by transfers, which are strategically placed to prevent disruptions caused by closely-spaced interchanges.^[38] The overall purpose of the collector-express system is to maximize traffic flow for both local and long-distance traffic and, along with the COMPASS system, to manage traffic flow.^[39]

Highway 401's widest point has eighteen lanes in the mainline with an additional four lanes used as connecting ramps.

Two sets of collector-express systems exist in the GTA. The first set is currently 6.6 km (4.1 mi) long and connects Highway 403, Highway 410 and Highway 427.^[40] This system primarily serves to accommodate and organize various traffic movements from the Highway 403 / 410 and Highway 427 interchanges along Highway 401. East of the interchange with Renforth Drive, the collector lanes diverge to become the on-ramps to Highway 27, 427 and Eglinton Avenue. The second 43.7 km (27.2 mi) system passes through the centre of Toronto and ends in Pickering to the east.^[41] The 5 km (3.1 mi) gap between the two systems is a traffic bottleneck. However, the interchange cannot currently accommodate future widening of Highway 401.^[42]

Highway 401 widens to a total of eighteen lanes south of Toronto Pearson International Airport.^[8] Progressing eastward, eight lanes are carried beneath the large spaghetti junction at Highway 427. The highway curves northeast and follows a power transmission corridor to Highway 409, which merges with the mainline and forms the collector lanes. It returns to its eastward route through Toronto, now carrying fourteen to sixteen lanes of traffic on four carriageways.^[36][43]

Traffic cameras are mounted at every exit within Toronto and form one part of the COMPASS system.

To manage traffic through this heavily travelled section of roadway, Highway 401 was equipped with a traffic camera system called COMPASS in early 1991.^[44] Using a combination of closed-circuit television cameras, vehicle detection loops and LED changeable message signs, COMPASS allows the Ontario Ministry of Transportation Traffic Operations Centre to obtain a real-time assessment of traffic conditions and alert drivers of collisions, congestion and construction.^[39] The system currently stretches from the Highway 403 / 410 interchange in Mississauga to Harwood Avenue in Ajax.^[45]

Highway 401 is often congested in this section, with an average of over 430,000 vehicles passing between Weston Road and Highway 400 per day as of 2006.^[2][8] In spite of this congestion, it is the primary commuting route in Toronto; over 50% of vehicles bound for downtown Toronto use the highway.^[46]

East of Highway 400 is The Basketweave, a criss-crossing transfer between the express and collectors carriageways.^[36] Twelve lanes pass beneath a complicated interchange with Allen Road, built to serve the cancelled Spadina Expressway. Further east, the highway crosses Hogg's Hollow, over the West Don River, and interchanges with Yonge Street in the centre of Toronto. It then crosses the East Don River and climbs toward the Don Valley Parkway, which provides access to downtown Toronto and Highway 404, which provides access to the suburbs to the north. Progressing eastward, the highway continues through mostly residential areas in Scarborough, eventually reaching the Rouge Valley on the city's eastern edge and crossing into Pickering.^[36]

At Pickering, the highway again meets the former Highway 2, which runs parallel to the Quebec border.^[20] As the highway approaches Brock Road in Pickering, the collector and express lanes converge, narrowing the fourteen lane cross-section to ten, divided only at the centre.^[43] It remains this width as it passes into Ajax,^[36] before narrowing back to six lanes at Salem Road.^[47]

The stretch of Highway 401 through Whitby and Oshawa features several structures completed during the initial construction of the highway in the 1940s.^[42] Several of these structures, including the former CN overpass, are slated for demolition, either due to their age, or to prepare for the planned widening of Highway 401 through this area.^[48] At Harmony Road, the suburban surroundings are quickly replaced by agricultural land. The highway curves around the south side of Bowmanville and travels towards Highway 35 and Highway 115.^[35]

Different coloured signs on Highway 401's collector-express system are utilized to avoid confusion. The express lanes use green signs and the collector lanes use blue. These particular signs are located at The Basketweave.

Eastern Ontario

East of Highway 35 and Highway 115 to Cobourg, Highway 401 passes through a mix of agricultural land and forests, maintaining a straight course.^[49] As the highway passes through Cobourg, it narrows to four lanes and enters the Canadian Shield, an ancient, rocky geological formation. The terrain becomes undulating, and the highway veers around hills and through valleys along the shores of Lake Ontario.^[50] At Trenton, the highway crosses the Trent Canal and leaves the Shield, returning to an agricultural setting as it heads eastward to Kingston. The Kingston portion of the highway, originally named the Kingston-Bypass, was one of the first sections of the highway to be completed.^[51]

East of Highway 416, Highway 401 has lower traffic volumes.

East of Kingston, the highway continues through a predominantly agricultural area alongside the Saint Lawrence River to Gananoque, where it splits with the Thousand Islands Parkway.^[52] The current Highway 401 runs parallel to the parkway several kilometres inland from the river. The Canadian Shield returns through this heavily forested section of the highway. Highway 401 rejoins the Thousand Islands Parkway immediately southwest of Brockville, now heading northeast.^[53]

The remainder of the highway runs parallel to the former Highway 2 along the shore of the Saint Lawrence River within the St. Lawrence Valley. Northeast of Brockville is the interchange with Highway 416, which heads north towards Ottawa.^[54] At the Quebec border, Highway 401 becomes Autoroute 20 and continues to Montreal.^[55]

History

Predecessors

Highway 401 colour-coded by the years each section opened to traffic.

Highway 401's history predates its designation by over two decades. As automobile use in southern Ontario grew in the early twentieth century, road design and construction advanced significantly. Following frequent erosion of the former macadamized Lake Shore Road,^[56] a cement road known as the Toronto–Hamilton Highway was proposed in January 1914.^[57] The highway was designed to run along the lake shore, instead of Dundas Street to the north, because the numerous hills encountered along Dundas would have increased costs without improving accessibility. Middle Road, a dirt lane named because of its position between the two, was not considered since Lake Shore and Dundas were both overcrowded and in need of serious repairs.^[58] The road was formally opened on November 24, 1917,^[56] 5.5 m (18 ft) wide and nearly 64 km (40 mi) long. It was the first concrete road in Ontario, as well as one of the longest stretches of concrete road between two cities in the world.^[59]

Over the next decade, vehicle usage increased substantially, and by 1920 Lakeshore Road was again highly congested on weekends.^[60] In response, the Department of Highways examined improving another road between Toronto and Hamilton. The road was to be more than twice the width of Lakeshore Road at 12 m (39 ft), and would carry two lanes of traffic in either direction.^[61] Construction on what was then known as the Queen Street Extension west of Toronto began in early 1931,^[62]

The former Highway 2A near Highland Creek, aside from a resurfaced pavement, has not been altered since it opened in 1947.

Before the highway could be completed, Thomas McQuesten was appointed the new minister of the Department of Highways, with Robert Melville Smith as deputy minister, following the 1934 provincial elections.^[42] Smith, inspired by the German Autobahn's—new "dual-lane divided highways"—modified the design for Ontario roads,^[63] and McQuesten ordered that the Middle Road be converted into this new form of highway.^[64][65][66] A 40 m (130 ft) right-of-way was purchased along the Middle Road and construction began to convert the existing sections to a divided highway, as well as on Canada's first interchange at Highway 10.^[61]

Beginning in 1935, McQuesten applied the concept of a dual-highway to several projects along Highway 2, including along Kingston Road in Scarborough Township.^[42][67]

When widening in Scarborough reached the Highland Creek ravine in 1936, the Department of Highways began construction on a new bridge over the large valley, bypassing the former alignment around West Hill.^[68] From here the highway was constructed on a new alignment to Oshawa, avoiding construction on the congested Highway 2.^[7] As grading and bridge construction neared completion on the new highway between West Hill and Oshawa in September 1939, World War II broke out and gradually money was siphoned from highway construction to the war effort.^[42]

At the same time, between September 6 and 8, 1939, the Ontario Good Roads Association Conference was held at Bigwin Inn, near Huntsville,^[70] drawing highway engineers from across North America to discuss the new concept of "Dual Highways". On the first day of the convention, McQuesten announced his vision of the freeway: an uninterrupted drive through the scenic regions of Ontario, discouraging local business and local traffic from accessing the highway except at infrequent controlled-access points.^[69] It was quickly announced in the days thereafter that this concept would be applied to a new "trans-provincial expressway", running from Windsor to the Quebec border.^[71]

Highway engineers evaluated various factors, including grading, curve radius, and the narrow median, used along the Middle Road (which was inaugurated on August 23, 1940 as the Queen Elizabeth Way),^[72] and began to plan the course of a new dual highway mostly parallel to Highway 2, with precedence given to areas most hampered by congestion. Unlike the Queen Elizabeth Way (QEW), this highway would not be built along an existing road, but rather on a new right-of-way, avoiding the need to provide access to properties.^[42][69]

Along with immense improvements to machinery and construction techniques over its six-year course, the war provided ample opportunity for planners to conduct a large-scale survey of 375,000 drivers, asking what their preferred route would be to get to where they needed to go. Using this information, a course was plotted from Windsor to Quebec, bypassing all towns along the way.^[7][73]

The Highway 400 interchange in 1953. Today, the former cloverleaf has been replaced with a multilevel interchange.

Highway 2S, for Scenic, was the first completed section of new roadway. Built to connect with the Thousand Islands Bridge at Ivy Lea and opened as a gravel road in late 1941 or early 1942,^[74] the road followed the shore of the St. Lawrence River and connected with the western end of the twinned Highway 2 near Brockville.^[20]

Following the war, construction resumed on roadways throughout Ontario. The expressway between Highland Creek and Oshawa was completed in December 1947,^[7] while other sections remained on the back burner. The Toronto–Barrie Highway was the primary focus of the Department of Highways at the time, and the onset of the Korean War in 1949 continued to stall construction. Despite the delays, highway minister George Doucette officially announced the plans for construction of the new trans-provincial expressway in 1950, with the Toronto to Oshawa expressway serving as a model for the design.^[42] Work on the most important link, the Toronto Bypass, began in 1951,^[42] but it would not open with that name.

Assumption

Heavy traffic traverses Highway 401 within Toronto 24 hours a day.

In July 1952 (possibly July 1, the same day Highway 400 was numbered),^{[note 2][75]} the Highland Creek to Oshawa expressway and Highway 2S were designated Controlled-Access Highway No 401,^[7] a move scorned by one critic because of the lack of thought into the names.^[76] That same year, construction wrapped up on the first section of the Toronto Bypass; between Highway 400 and Dufferin Street in August, west to Weston Road in September, east to Bathurst Street in October and finally to Yonge Street in December.^[1] Extensions east and west began in 1953; the eastern extension to Bayview Avenue would open in April 1955,^[1] the western extension was delayed by Hurricane Hazel's arrival on October 15, 1954, which nearly destroyed the new bridge over the Humber River. The reconstruction would take until July 8, 1955,^[77] with the highway opening between Weston and Highway 27 in December, 1955.^[1]

The entire bypass, including the widening of Highway 27 into an expressway south of Highway 401,^[78] was completed in August 1956.^[1][7] Upon its opening, the bypass was described by one reporter as "a motorist's dream" providing "some of the most soothing scenery in the Metropolitan area." The reporter continued, with regard to the eastern section through Scarborough, that it "winds smoothly through pastures across streams and rivers, and beside green thickets. It seems a long way from the big city."^[7]

Highway 401 was completed in 1968. This plaque near Brockville commemorates the official opening of the highway.

By 1959 however, the bypass was a lineup of cars, as 85,000 drivers crowded the roadway, designed to handle a maximum of 48,000 vehicles, on a daily basis.^[7] The convenience of a road to get across the city helped influence the suburban shift in Toronto, and continues to be a driving force of suburban sprawl today.^[75]

Meanwhile, beyond Toronto, the highway was being built in a patchwork fashion, focusing on congested areas first.^[42] Construction west from Highway 27 began in late 1954,^[51] as did the Kingston Bypass in Eastern Ontario.^[79] Work began to connect the latter with the Scenic Highway in 1955.^[51] By 1956, construction had begun on the segment between Highway 4 in London and Highway 2 in Woodstock, as well as on the section between Windsor and Tilbury.^[80]

By the end of 1960, the Toronto section of the highway was extended both eastwards and westwards: first, to the east between Newcastle and Port Hope by June 30, then later to the west between Highway 25 in Milton and Highway 8 south of Kitchener on November 17.^[1] By mid-1961, the section between Brighton and Marysville had opened.^[81] The gap to the east, from Highway 28 in Port Hope to Highway 30 in Brighton was opened on July 20, 1961.^[82]

The gap between Woodstock and Kitchener was completed on November 9, 1961, while the gap between Tilbury and London was completed two lanes at a time; the northbound lanes were completed on October 22, 1963, the southbound on July 20, 1965.^[1] The gap between Marysville and Kingston was opened by 1962.^[81] The final sections, from west of Cornwall to Lancaster, were opened in 1963 and 1964.^[81][83] Finally, on October 11, 1968, the Thousand Islands Bypass opened.^[7] This final piece was commemorated with a plaque to signify the "completion" of Highway 401.^[42]

The widening of Highway 401 from four to twelve lanes in Toronto took nine years and was accomplished with at least four lanes open at all times. Shown here is the Highway 401 / Don Valley Parkway / Highway 404 interchange under construction in 1965.

In Toronto, engineers and surveyors were examining the four-lane bypass, while planners set about designing a way to handle the commuter highway. In 1963, transportation minister Charles MacNaughton announced the widening of Highway 401 in Toronto from four to a minimum of twelve lanes between Islington Avenue and Markham Road. The design was taken from the Dan Ryan Expressway in Chicago, which was widened into a similar configuration around the same time.^[7] Construction began immediately. While the plan initially called for construction to end in 1967, it continued for nearly a decade. A minimum of four lanes were always open during the large reconstruction project, which included complex new interchanges at Highway 27, Highway 400, the planned Spadina Expressway and the Don Valley Parkway. The system was completed in 1972, along with the Highway 27 bypass north of Highway 401. Most of the interchanges in Toronto were reconstructed as partial cloverleafs, and a continuous lighting system was also installed.^[42]

In January 1965, the Premier of Ontario, John Robarts, designated Highway 401 the Macdonald–Cartier Freeway to honour two of Canada's Fathers of Confederation.^[7] Unlike other names later applied to the highway, the Macdonald–Cartier Freeway designation covers the entire length of Highway 401. Signs designating the freeway, and shields with the letters 'M-C' were installed but these disappeared by 1997.^[84] In 2003, 38 years after Robarts' naming of the highway, an MPP attempted to get the Macdonald-Cartier Freeway highway name enshrined into law; the bill only passed first reading and was not enacted.^[85]

In the 1970s, Highway 401 was widened to six lanes in Durham, but otherwise saw little improvement.^[42] The 1980s saw more sections widened, as well as a new collector-express system between Highway 403 / 410 and Highway 427 completed in mid-1985.^[86] Plans were made to extend the eastern system from Neilson Road to Brock Road in Pickering in the late 1980s,^[87] and took over a decade to reach fruition by 2000.^[88][89] This was followed shortly thereafter by the widening of the highway through Ajax and a new interchange at Pickering Beach Road (renamed Salem Road) and Stevenson Road.^[90]

The 1990s also saw the first step in widening the highway to six lanes from Toronto to London.^[91] A project in the mid-1990s brought the highway up to a minimum of six lanes between Highway 8 in Kitchener and Highway 35 / 115 in Newcastle.^[92] Other projects prepared sections for eventual widening.^[93]

In 1993, the stretch of Highway 401 eastbound near Milton and westbound near Whitby had chevrons painted in each lane in an effort to reduce tailgating, a concept borrowed from France and Britain. Signs advised motorists to keep at least two chevrons apart, in essence warning them not to follow too closely.^[94] Some of these chevrons remain intact in the westbound lanes in Whitby, though the signs stating their use have since been removed.^[95]

Beginning in 1998, several projects were initiated on Highway 401 within Toronto. These included the addition of one lane through the Highway 427 interchange in 2005, as well as the resurfacing of the pavement.^[96]

Highway 401 at Meadowvale Road in 1989 prior to being widened to 14 lanes

Advantage I-75

Between June 1990 and 1998, Highway 401 and Interstate 75 were used for a pilot project named Advantage I-75 to test out the reliability and versatility of an automated tracking system for transport trucks. Termed MACS for Mainline Automated Clearance System, it would allow a truck to travel from Florida to Ontario without a second inspection.^[97] MACS was initially tested out at two truck inspection stations in Kentucky, with transponders installed in 220 trucks. Exact time, date, location, weight and axle data were logged as a truck approached an equipped station.^[98] Following initial tests, MACS was deployed at every inspection station along I-75 from Miami to Detroit, and along Highway 401 from Windsor to Belleville in 1994.^[97] The project demonstrated the effectiveness of electronic systems in enforcing freight restrictions without delaying vehicles, while alleviating security fears that such systems could be easily compromised. The concept has since been applied to many parts of Canada, including Highway 407's electronic tolling system.^[99]

"Carnage Alley"

Around the same time, between Windsor and London the Carnage Alley name was applied to Highway 401, a reference to the numerous accidents that occurred throughout the 1990s.^[42] The narrow and open grass median was not much of an obstacle in preventing cross-median collisions. The nature of that section of highway, described as largely a straight road with a featureless agricultural landscape, was said to make drivers feel less involved and lose focus on the road. Several accidents resulted from motorists deviating from their lane and losing control of their vehicles. ^[100][101]

Various other names, including The Killer Highway circulated for a time,^[102] but Carnage Alley became predominant following an 87-vehicle pile-up on September 3, 1999, the worst in Canadian history, that claimed eight lives and injured forty-five.^[103]

The 87-vehicle pile up on September 3, 1999.

Only a few days prior, then-Transportation Minister David Turnbull had deemed the highway "pleasant" to drive.^[104] On the morning of September 3, the local weather station reported clear conditions due to a malfunction,^[103] while a thick layer of fog rolled onto the highway. Dozens of vehicles including several semi-trailers quickly crashed into each other shortly after 8 a.m., one following another in the dense fog, and the accumulating wreckage caught traffic traveling in the opposite direction.^[105][106]

Immediately following the accident, the MTO installed paved shoulders with rumble strips^[107] and funded additional police to patrol the highway, a move criticized as being insufficient.^[108]

Beginning in 2004, 46 km (29 mi) of the highway was widened from four asphalt lanes to six concrete lanes, paved shoulders were added, a concrete Ontario Tall Wall median was installed,^[109] which was the solution that the Canadian Automobile Association promoted in 1999.^[101] Interchanges were improved and signage was upgraded as part of a five-phase project to improve Highway 401 from Highway 3 in Windsor to Essex County Road 42 (formerly Highway 2) on the western edge of Tilbury.^[27]

Patriotic Canadians line overpasses along the Highway of Heroes to pay their respects to the fallen soldiers who pass by.

Highway of Heroes

On August 24, 2007, the MTO announced that the stretch of Highway 401 between Glen Miller Road in Trenton and the intersection of the Don Valley Parkway and Highway 404 in Toronto would bear the additional name Highway of Heroes, in honour of Canada's fallen servicemen and servicewomen,^[110] though Highway 401 in its entirety remains designated as the Macdonald–Cartier Freeway.^[111] This length of the highway is often travelled by a convoy of vehicles carrying a fallen soldier's body, with his or her family, from CFB Trenton to the coroner's office at the Centre for Forensic Sciences in Toronto. Since 2002, when the first of Canada's fallen soldiers were returned from Afghanistan, crowds have lined the overpasses to pay their respects as convoys pass.^[112]

The origin of the name can be traced to a June 23, 2007 article in the Toronto Sun by columnist Joe Warmington, in which he interviewed Northumberland photographer Pete Fisher. Warmington described the gathering of crowds on overpasses to welcome fallen soldiers as a "highway of heroes phenomena."^[113] This led a Crahame Township volunteer firefighter to contact Fisher on July 10 about starting a petition, leading Fisher to publish an article which was posted to the Northumberland Today website.^[114] The online article eventually caught the attention of London resident Jay Forbes. Forbes began a petition, which received over 20,000 signatures^[110] before being brought to the Minister of Transportation on August 22.^[115] Following the announcement on August 24, the provincial government and MTO set out to design new signs. The signs were erected and unveiled on September 7,^[111] and include a smaller reassurance marker (shield), as well as a larger billboard version.^[116]

Recent history

Highway 401 was closed during a series of propane explosions in Toronto in 2008, allowing for this rare photo of the 14-lane highway occupied by a single vehicle.

On Sunday August 10, 2008, following a series of explosions at a propane facility in Toronto, the Highway 401 was closed between Highway 400 and Highway 404 as a precautionary measure; the largest closure of the highway in its history.^[117] The highway remained closed until 8 p.m., though several exits near the blast remained closed thereafter.^[118][119]

Between 2006 and 2008, Highway 401 was widened from four to six lanes between Highway 402 and Wellington Road in London. This included replacing the original Wellington Road overpass.^[27] In Oshawa, Exit 416 (Park Road) was replaced by a new interchange at Exit 415 (Stevenson Road). The contract, which began September 7, 2005, included the interchange and the resurfacing of 23.4 km (14.5 mi) of the highway between Oshawa and Highway 35 / Highway 115.^[120] The westbound ramps were opened in mid-September 2007^[121] and the eastbound ramps in mid-2009. The resurfacing will be completed through the summer of 2010.^[120]

Future

Despite its width, traffic congestion is common along many sections of Highway 401.

The MTO intends to widen all of the remaining four-lane sections to a minimum of six and place an Ontario Tall Wall along the entire length of the highway.^[109][122]

Windsor–Essex Parkway

In 2004, it was jointly announced by the American and Canadian governments that a new border crossing would be constructed between Detroit and Windsor. The Detroit River International Crossing (DRIC) was formed as a bi-national committee to manage the project.^[123] The MTO took advantage of this opportunity to extend Highway 401 to the international border and began an environmental assessment on the entire project in late 2005.^[123] The City of Windsor also hired New York traffic consultant Sam Schwartz to design a parkway to the border. Schwartz's proposal would eventually inspire the DRIC's own design, but his route was not chosen, with the DRIC opting instead to take a northern route.^[124] On February 8, 2008, the MTO announced that it had begun purchasing property south of the E.C. Row Expressway, upsetting many area residents who had purchased properties in the years prior.^[125][126]

On March 3, 2008, the Michigan Department of Transportation and the MTO (in partnership with Transport Canada, the Federal Highway Administration of the United States and the Detroit River International Crossing group) completed a joint assessment on the soils along the Detroit River, and determined that they could indeed support the weight of a new bridge; the stability of the underlying soil and clay, and the impact of the nearby Windsor Salt mine, had caused a great deal of concern for all parties involved in the project.^[127]

Despite protest from area residents,^[128] as well as a lawsuit from Ambassador Bridge owner Matty Moroun,^[129] it was announced on May 1, 2008 that a preferred route had been selected and that the new route would be named the Windsor–Essex Parkway.^[18] The new parkway will be below-grade and have six through-lanes. It will follow (but not replace) Talbot Road and Huron-Church Road from a new interchange at the current end of Highway 401 to the E.C. Row Expressway, where it will run concurrently westward for 2 km (1.2 mi). From there, it will turn northwest and follow a new alignment to the border.^[130] Initial construction of a noise barrier from North Talbot Road to Howard Avenue began in March 2010. Two new bridges south of the current Highway 3/401 junction are also under construction.^[131] The project has an expected completion date of 2013.^[132]

Southwestern Ontario

Highway 401 was recently widened in London east of Highway 402.

In Southwestern Ontario, several improvements are under way to provide six lanes on Highway 401 from Windsor to Toronto,^[122] in response to the Carnage Alley pile-up in 1999.^[109][133] West of Manning Road, the highway is currently being widened in anticipation of the Windsor–Essex Parkway.^[18][134] Between Tilbury and Highway 402, the highway remains four lanes wide with a grass median. The widening and upgrading of this section is in the planning stages, with construction possibly beginning in 2012 and lasting for several years. Several interchanges are slated to be upgraded as part of this construction.^[135]

Within the London area, traffic volumes are expected to increase considerably, leading to poor highway conditions. The province has put in place an extensive plan to widen and reconstruct the London corridor between 2006 and 2021.^[136] This includes building a new interchange with Wonderland Road to help improve access to Highway 401 westbound from the city's southwest end. This may also include partial interchanges along White Oaks Road with Highways 401 and 402.^[137] This project will coincide with reconstructing the outdated cloverleaf interchange at Colonel Talbot Road^[138] and widening Highway 401 from four to six lanes between Highway 4 and Highway 402. Construction could start as early as 2013.^[139] In addition, an environmental assessment is underway to examine the impact of reconstructing the three-way trumpet interchange with the Veterans Memorial Parkway into a four-way interchange in order to extend the expressway south of Highway 401.^[140][141] The MTO has also proposed widening Highway 401 from six to eight lanes through London between Highway 402 and Highbury Avenue.^[142]

East of London, widening the highway to six lanes with a tall wall median and paved shoulders between Woodstock and Kitchener is a priority for the MTO. The completion of this remaining four-lane gap will bring the entire London–Toronto segment up to six lanes.^[31] Long term plans call for Highway 401 in the Waterloo region to be widened to eight lanes as well. The interchange between Highway 401 and Highway 8 (King Street) is to be reconstructed to make it free-flowing for all directions of travel, easing congestion and improving traffic flow in the area.^[143]

Work is underway to widen Highway 401 from six to fourteen lanes between Highway 403 / 410 (pictured) and Hurontario Street.

Central Ontario

In their 2007 plan for southern Ontario, the MTO announced long-term plans to create high-occupancy vehicle (HOV) lanes from Mississauga Road west to Milton.^[144] Construction is also underway to widen Highway 401 to a collector-express system from Highway 403 and Highway 410 west to Hurontario Street, a distance of 2.8 km (1.7 mi).^[145]

Within Toronto, a select number of projects are being completed during overnight construction projects, including the widening and rehabilitation of the Hogg's Hollow bridge,^[146] the replacement of the original gantries throughout the collector-express system,^[147] and reconstructing the Highway 401/400 interchange.^[148]

Current expansion plans in Durham include the construction of two new freeways north from Highway 401. The first will be directly east of Durham Regional Road 23 (Lakeridge Road),^[149] while the second will lie to the east of Durham Regional Road 34 (Courtice Road).^[150] Alongside the extension of Highway 407, Highway 401 will be widened to twelve lanes, forming an extension to the current collector-express system, from its current end at Durham Regional Road 1 (Brock Road) in Pickering to Durham Regional Highway 12 (Brock Street) in Whitby.^[151] Long term plans also call for HOV lanes to run from Brock Road to Durham Regional Road 33 (Harmony Road), though no planning has commenced.^[144]

Eastern Ontario

East of Durham, the MTO is planning to widen the entire length of Highway 401 to six lanes.^[122] Preliminary work includes the widening of the bridge over the Trent River in Trenton,^[152] as well as the realignment of some roads alongside the highway.^[153] By mid 2012, the highway will be widened for 6 km (3.7 mi) through Kingston.^[154]

Services

A new "ONroute" service station near Tilbury.

Highway 401 features 19 service centres controlled by the MTO. These service centres were announced in 1961 following public outcry to the lack of rest stops. They provide a place to park, rest, eat and refuel 24 hours a day.^[7]

The centres were originally leased to and operated by several major gasoline distributors; however, those companies have chosen not to renew their leases as the terms end. In response, the MTO put the operation of the full network of service centres out for tender, resulting in a 50-year lease with Host Kilmer Service Centres, a joint venture between hospitality company HMSHost (a subsidiary of Autogrill) and Larry Tanenbaum's investment company Kilmer van Nostrand.^[155]

Seventeen of the centres along Highway 401 will be reconstructed entirely. Two centres that were rebuilt in the late 1990s, specifically Newcastle and the westbound location at Woodstock, will not be redeveloped at this time. Work on 15 of the 17 service centres to be reconstructed began in late 2009 or early 2010. The new service centres, to open in phases beginning in July 2010, will feature a Canadian Tire gas station and convenience store, as well as fast food brands such as Tim Hortons, A&W and Burger King.^[156]

Service centres are located at the following points along Highway 401:

Exit list

Division	Location	km[2]	Exit[20]	Destinations	Notes
Essex	Windsor	0.0	–	Highway 3 west – Ambassador Bridge to US	Westbound exit and eastbound entrance
		2.6	13	Dougall Avenue – Detroit-Windsor Tunnel to US	Westbound exit and eastbound entrance; Formerly Highway 3B / Highway 401A
		3.4	14	County Road 46 (Walker Road) – Windsor, Essex	Formerly Highway 98
	Tecumseh	10.4	21	County Road 19 (Manning Road) – Tecumseh
	Lakeshore
		17.5	28	County Road 25 (Puce Road) – Puce
		23.7	34	County Road 27 (Belle River Road) – Woodslee, Belle River
		30.0	40	County Road 31 (French Line Road) – St. Joachim
		37.3	48	Highway 77 south – Leamington County Road 35 north (Comber Road) – Stoney Point
		45.7	56	County Road 42 – Tilbury	Formerly Highway 2
Chatham-Kent	Tilbury	52.8	63	County Road 2 (Queen's Line)	Formerly Highway 2
	Chatham	70.9	81	County Road 27 (Bloomfield Road)
		79.3	90	Highway 40 north County Road 11 south (Communication Road) – Blenheim
		91.0	101	County Road 15 (Kent Bridge Road) – Dresden, Ridgetown
		98.3	109	County Road 17 / County Road 21 (Victory Road) – Thamesville, Ridgetown	Formerly Highway 21
		106.2	117	County Road 20 (Orford Road) – Highgate
Elgin	West Elgin	119.2	129	County Road 103 (Furnival Road) – Wardsville, Rodney
		127.3	137	County Road 76 (Graham Road) – West Lorne	Formerly Highway 76
	Dutton/Dunwich	138.5	149	County Road 8 (Currie Road) – Dutton
		147.4	157	County Road 14 (Iona Road) – Melbourne, Iona
	Southwold
		154.1	164	County Road 20 (Union Road) – Port Stanley, Shedden
Middlesex	London	166.7	177	Highway 4 (Colonel Talbot Road) – St. Thomas	Signed as exits 177A (south) and 177B (north)
		173.2	183	Highway 402 west – Sarnia	Westbound exit and eastbound entrance
		175.9	186	Wellington Road
		176.8	187	Exeter Road	Formerly Highway 135 west
		179.1	189	Highbury Avenue – St. Thomas	Formerly Highway 126
		183.6	194	Veterans Memorial Parkway	Formerly Highway 100
	Thames Centre	185.5	195	County Road 74 (Westchester Bourne) – Nilestown, Belmont	Formerly Highway 74
		189.3	199	County Road 32 (Dorchester Road) – Dorchester
		193.0	203	County Road 73 (Elgin Road) – Aylmer	Formerly Highway 73
		198.5	208	County Road 30 (Putnam Road) – Putnam, Avon
Oxford	South-West Oxford, Ingersoll	206.0	216	County Road 10 (Culloden Road)
		208.5	218	Highway 19 south County Road 119 north (Plank Line) – Tillsonburg
	South-West Oxford	212.2	222	County Road 6 – Stratford, Embro
		219.8	230	County Road 12 (Sweaburg Road / Mill Street) – Sweaburg
	Woodstock
		221.9	232	County Road 59 – Delhi	Formerly Highway 59
		225.3	235	Highway 403 east – Brantford, Hamilton	Eastbound exit and westbound entrance
	Norwich
		226.3	236	County Road 15 (Towerline Road) – Woodstock
		227.9	238	County Road 2 – Paris, Woodstock	Formerly Highway 2
	Woodstock
	Blandford-Blenheim	240.1	250	County Road 29 (Drumbo Road) – Innerkip, Drumbo
Waterloo	North Dumfries	257.9	268	Regional Road 97 (Cedar Creek Road) – Cambridge, Plattsville, Ayr	Signed as exits 268A (east) and 268B (west) eastbound; formerly Highway 97
	Kitchener, Cambridge	265.0	275	Regional Road 28 (Homer Watson Boulevard / Fountain Street)	Replaced Doon-Blair Road exit in the 1970s
		267.9	278	Highway 8 north – Kitchener, Waterloo Regional Road 8 south – Cambridge	Signed as exits 278A (east) and 278B (west) eastbound
	Cambridge	272.5	282	Regional Road 24 (Hespeler Road) to Highway 24
		–	284	Regional Road 36 south (Franklin Boulevard)	Eastbound exit and westbound entrance
		276.5	286	Regional Road 33 (Townline Road) County Road 33 (Townline Road)
Wellington	Puslinch
		285.7	295	Highway 6 north – Guelph	West end of Highway 6 overlap
		290.1	299	Highway 6 south – Hamilton County Road 46 (Brock Road) – Guelph, Hamilton	East end of Highway 6 overlap
Halton	Milton	301.9	312	Regional Road 1 (Guelph Line) – Burlington, Campbellville
		310.1	320	Regional Road 25 – Acton, Milton	Formerly Highway 25; GO Transit bus stop on eastbound ramp.
		313.8	324	Regional Road 4 (James Snow Parkway)
		318.0	328	Regional Road 3 (Trafalgar Road) – Oakville, Halton Hills, Georgetown
		320.4	330	Highway 407	Signed as exit 330 westbound; as exits 330A (west) and 330B (east) eastbound; no access from westbound 407 to eastbound 401 or westbound 401 to eastbound 407
Peel	Mississauga	322.7	333	Winston Churchill Boulevard
		326.1	336	Regional Road 1 (Mississauga Road / Erin Mills Parkway)
		329.6	340	Mavis Road
		331.7	342	Hurontario Street	Formerly Highway 10
		334.5	344	Highway 403 / Highway 410 – Hamilton, Brampton	No access from eastbound 401 to westbound 403 or eastbound 403 to westbound 401
		336.0	346	Regional Road 4 (Dixie Road)
		340.3– 341.1	348	Highway 427 / Renforth Drive – Toronto Pearson International Airport, Downtown Toronto	Eastbound exit and westbound entrance
Toronto		341.1	350	Eglinton Avenue	Eastbound exit and westbound entrance
			351	Carlingview Drive	Westbound exit and eastbound entrance
			352	Highway 427 south	Westbound exit and eastbound entrance
		343.5	354	Dixon Road / Martin Grove Road
		–	355	Highway 409 – Toronto Airport Belfield Road	Westbound exit and eastbound entrance
		346.0	356	Islington Avenue
		347.4	357	Weston Road
		348.9	359	Highway 400 north (south to Black Creek Drive) – Barrie	Eastbound express access to Highway 400
		350.5	360	Jane Street	Ramps removed, access to Jane Street via Black Creek Drive.
		352.0	362	Keele Street
		354.0	364	Dufferin Street, Yorkdale Road	Eastbound exit and westbound entrance
		354.8	365	Allen Road, Yorkdale Road
		356.2	366	Bathurst Street	Westbound exit and eastbound entrance
		357.3	367	Avenue Road	Formerly Highway 11A
		359.0	369	Yonge Street	Formerly Highway 11
		361.0	371	Bayview Avenue
		362.9	373	Leslie Street
		364.9	375	Highway 404 north – Richmond Hill, Newmarket Don Valley Parkway – Downtown Toronto
		366.3	376	Victoria Park Avenue
		367.6	378	Warden Avenue
		369.2	379	Kennedy Road
		370.8	380	Brimley Road south, Progress Avenue	Eastbound exit and westbound entrance from northbound Brimley Road
		371.6	381	McCowan Road
		373.2	383	Markham Road	Formerly Highway 48
			–	Progress Avenue
		375.0	385	Neilson Road
		376.5	387	Morningside Avenue
		379.0	389	Meadowvale Road
		380.3	390	Highway 2 / Highway 2A (Kingston Road, Sheppard Avenue (westbound), Port Union Road (eastbound))	Signed as exit 392 westbound
Durham	Pickering	384.0	394	Regional Road 38 (Whites Road)	Exit added in 1983[164]
		386.6	397	Regional Road 29 (Liverpool Road)	Westbound exit and entrance
		388.3	399	Regional Road 1 (Brock Road)
	Ajax	–	400	Church Street	Removed, exit replaced with Westney Road interchange (Exit 401) in 1988
		391.0	401	Regional Road 31 (Westney Road)	Replaced Exit 400 (Church Street) in 1988
		392.5	403	Regional Road 44 (Harwood Avenue)	Removed, exit replaced with Salem Road interchange (Exit 404) in 2003
		393.3	404	Regional Road 41 (Salem Road)	Replaced Exit 403 (Harwood Avenue) in 2003
	Whitby	399.6	410	Regional Highway 12 (Brock Street)	Formerly Highway 12
		402.1	412	Regional Road 26 (Thickson Road)
	Oshawa	–	415	Regional Road 53 (Stevenson Road)	Replaced Exit 416 (Park Road) in 2009
		405.2	416	Regional Road 54 (Park Road)	Removed, exit replaced with nearby Stevenson Road interchange (Exit 415) in 2009
		406.2	417	Regional Road 2 (Simcoe Street)	Westbound exit is via exit 418
		407.0	418	Regional Road 16 (Ritson Road)
		408.4	419	Regional Road 22 / Regional Road 33 (Bloor Street / Harmony Road)
	Clarington	413.9	425	Regional Road 34 (Courtice Road) – Courtice
		417.2	428	Holt Road (Darlington Nuclear Generating Station)	Eastbound exit and westbound entrance
		420.1	431	Regional Road 57 (Waverley Road) – Bowmanville
		421.3	432	Regional Road 14 (Liberty Street) – Bowmanville, Port Darlington
		423.8	435	Bennett Road
		425.3	436	Highway 35 / Highway 115 – Peterborough, Orono, Lindsay
		428.5	440	Regional Road 17 (Mill Street) – Newcastle, Bond Head
		436.5	448	Regional Road 18 (Newtonville Road) – Newtonville
Northumberland	Port Hope	445.0	456	Wesleyville Road
		449.7	461	County Road 2 – Welcome	Formerly Highway 2
		453.1	464	County Road 28 – Peterborough, Bewdley	Formerly Highway 28
	Cobourg, Hamilton	460.9	472	County Road 18 (Burnham Street) – Gores Landing
		462.9	474	County Road 45 – Norwood, Baltimore	Formerly Highway 45
	Alnwick/Haldimand	475.4	487	County Road 23 (Lyle Street) – Centreton, Grafton
	Cramahe	485.6	497	County Road 25 (Percy Street / Big Apple Drive) – Colborne, Castleton
	Brighton	498.0	509	County Road 30 – Brighton, Campbellford	Formerly Highway 30
Hastings	Quinte West	510.4	522	County Road 40 (Wooler Road) – Trenton
		513.5	525	County Road 33 – Trenton, Frankford, Batawa	Formerly Highway 33
		514.6	526	County Road 4 (Glen Miller Road) – Trenton, CFB Trenton
		526.8	538	County Road 1 (Wallbridge-Loyalist Road) – Stirling
	Belleville
		531.0	543	Highway 62 – Marmora, Madoc to County Road 14	Signed as exits 543A (south) and 543B (north); formerly Highway 14
		531.7	544	Highway 37 – Tweed
	Tyendinaga	544.2	556	County Road 7 (Shannonville Road) – Shannonville, Tyendinaga Mohawk Territory
		554.7	566	Highway 49 County Road 15 (Marysville Road) – Picton, Deseronto, Tyendinaga Mohawk Territory
		558.8	570	County Road 10 (Deseronto Road) – Deseronto
Lennox and Addington	Greater Napanee
		567.1	579	County Road 41 – Napanee, Kaladar	Formerly Highway 41
		570.5	582	County Road 5 (Palace Road) – Napanee, Newburgh
	Loyalist	581.7	593	County Road 4 (Camden East Road) – Millhaven, Camden East	Formerly Highway 133
		587.3	599	County Road 6 (Wilton Road) – Yarker, Amherstview, Odessa
Frontenac	Kingston	599.2	611	County Road 38 – Harrowsmith, Sharbot Lake	Formerly Highway 38
		601.5	613	County Road 9 (Sydenham Road), Sydenham
		603.7	615	Sir John A. Macdonald Boulevard
		605.3	617	County Road 10 (Division Street) – Westport
		607.6	619	County Road 11 (Montreal Street) – Battersea
		611.4	623	Highway 15 – Smiths Falls, Ottawa
		620.5	632	County Road 16 (Joyceville Road) – Joyceville
Leeds and Grenville	Gananoque, Leeds and the Thousand Islands	633.6	645	County Road 32 – Crosby	Formerly Highway 32
		635.1	647	Thousand Islands Parkway – Ivy Lea, Rockport	Eastbound exit and westbound entrance
	Leeds and the Thousand Islands	636.5	648	Highway 2 – Gananoque County Road 2	Eastbound via exit 647
		647.6	659	County Road 3 (Reynolds Road) – Ivy Lea, Lansdowne, Rockport
		649.6	661	Highway 137 ( I-81 to US)
	Front of Yonge	663.9	675	County Road 5 (Mallorytown Road) – Mallorytown, Athens, Rockport
	Elizabethtown-Kitley	673.1	685	Thousand Islands Parkway	Westbound exit and eastbound entrance
		675.0	687	County Road 2 – Brockville	Formerly Highway 2
	Brockville	684.8	696	County Road 29 – Brockville, Smiths Falls	Formerly Highway 29 / Highway 42
		686.6	698	North Augusta Road – Brockville, North Augusta
	Augusta	693.2	705	County Road 15 (Maitland Road) – Merrickville, Maitland
	Prescott	704.6	716	County Road 18 (Edward Street) – Prescott, Domville
	Edwardsburgh/Cardinal	708.6	721A	Highway 416 north – Ottawa, Kemptville	Eastbound exit and westbound entrance; signed as exit 721 eastbound
		709.7	721B	Highway 16 (to NY 37) – Kemptville, Johnstown, US	Signed as exit 721 westbound
		718.4	730	County Road 22 (Shanly Road) – Cardinal
Stormont, Dundas and Glengarry	South Dundas	726.3	738	County Road 1 (Carman Road) – Iroquois
		738.8	750	County Road 31 – Ottawa, Morrisburg, Winchester	Formerly Highway 31
		746.9	758	Upper Canada Road
	South Stormont	758.2	770	County Road 14 (Dickinson Drive) – Ingleside
		766.4	778	County Road 35 (Moulinette Road) – Long Sault
		774.8	786	County Road Power Dam Drive	Eastbound exit and westbound entrance
	Cornwall	777.8	789	Highway 138 (Brookdale Avenue) – Ottawa, Hawkesbury, Three Nations Crossing to US
		780.5	792	McConnell Avenue
		784.6	796	County Road 44 (Boundary Road)
	South Glengarry
		793.1	804	County Road 27 (Summerstown Road) – Summerstown
		802.2	814	County Road 2 / County Road 34 – Lancaster, Alexandria, Hawkesbury	Formerly Highway 2 south / Highway 34 north
		813.4	825	County Road 23 (4th Line Road, Curry Hill Road)
Ontario–Quebec boundary		816.6	Continues east as A-20 towards Montreal, QC
Closed

See also

• 400-Series Highways of Ontario
• King's Highways
• List of Ontario provincial highways
• Southern Ontario Transportation
• The Basketweave

References

Notes

Sources

Bibliography

Books

• Brown, Ron (1997). Toronto's Lost Villages. Polar Bear Press. ISBN 1-896757-02-2. 
• Butorac, Yvonne (June 1, 1995). Great Exits – The 401. Boston Mills Press. ISBN 1550461370. 
• Emery, Claire; Ford, Barbara (1967). From Pathway to Skyway. Confederation Centennial Committee of Burlington. pp. 179–182. http://www.ourroots.ca/e/page.aspx?id=946226. Retrieved May 3, 2010. 
• Filey, Mike (1994). Toronto sketches 3: the way we were. Dundurn Press. pp. 61–62. ISBN 1-55002-227-X. http://books.google.ca/books?id=WCQKzZ6xW6sC&lpg=PA62&ots=CCJJJI8o_T&dq=%22Canada's%20First%20Superhighway%22&pg=PA61#v=onepage&q=%22Some%20Superhighway%20History%22&f=false. Retrieved February 10, 2010. 
• McIlwraith, Thomas F. (1997). Looking for old Ontario: two centuries of landscape change. University of Toronto Press. http://books.google.ca/books?id=XuhzkQTr8Y4C&lpg=PA222&ots=X8yp2HRxeq&dq=%22Highway%20401%22%20crosses%20%22Niagara%20Escarpment%22%20-encyclopedia&pg=PA222#v=onepage&q=&f=false. Retrieved March 13, 2010. 
• '401' The Macdonald–Cartier Freeway. Ministry of Transportation and Communications. 1972. 
• Shragge, John; Bagnato, Sharon (1984). From Footpaths to Freeways. Ontario Ministry of Transportation and Communications, Historical Committee. ISBN 0-7743-9388-2. 
• Stamp, Robert M. (1987). QEW – Canada's First Superhighway. The Boston Mills Press. ISBN 0-919783-84-8. 

Maps

• Ministry of Transportation of Ontario (2003). Official Ontario road map [map]. Cartography by Bryan Simmons. Retrieved June 14, 2010.
• Peter Heiler Ltd (2010). Ontario Back Road Atlas [map]. Cartography by MapArt. ISBN 978-1-55198-226-7.

External links

• Ontario Ministry of Transportation
• Live COMPASS Traffic Cameras
• Highway 401 at OntHighways
• Highway 401 at vintagekingshighways.com
• Video of Highway 401 between the Humber River and Mississauga Road
• Windsor-Essex Parkway web site