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Ontario Highway 402

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Although Highway 402 was one of the original 400-series highways when it was designated in 1953, the freeway originally merged into Highway 7 near the present Highway 40 interchange in what was, at the time, Sarnia Township. In 1972, construction began to extend Highway 402 from Sarnia to Highway 401 near London thus creating a bypass to Highway 7; construction took over a decade. The final section of the extension, between Highway 81 and Highway 2, opened to traffic in 1982. The removal of an intersection at Front Street in Sarnia made the entire route a controlled-access highway.

Motorists crossing into Michigan at the western end have direct access to Interstate 69 (I-69) and Interstate 94 (I-94) into Port Huron; motorists crossing onto the Canadian side from the east end of I-69 and I-94 have access to Toronto via Highway 401, and onwards to Montreal via A-20 in Quebec. The only town along Highway 402 between Sarnia and London is Strathroy.

Since September 26, 2019, the speed limit is 110 km/h (68 mph) on most of its length, with the exceptions of the speed limit of 100 km/h (62 mph) in Sarnia and near the Highway 401 interchange.

Route description

Highway 402 begins on the Canadian side of the Blue Water Bridge. Across the St. Clair River, Highway 402 continues in Michigan as I-69 and I-94. The twin bridge crossing has six lanes of traffic and non-stop freeway access. This provides a quicker route than the busier Ambassador Bridge crossing in Windsor, which features over ten traffic lights leading to the four-lane bridge, although that situation is expected to be rectified after the planned Gordie Howe International Bridge is constructed. Although Highway 402 passes through Sarnia, it is not intended to operate as a commuter highway; at Highway 40 and westward all ramps leading to the westbound lanes of the freeway were originally signed as "Bridge To U.S.A." without reference to Highway 402, though these have been replaced in the early 2000s with signs saying "402 West Bridge To U.S.A.".

After descending over the village of Point Edward and passing through a customs plaza, the freeway curves as it crosses Front Street (former Highway 40B) and a former railway line. Running north of the former Holmes Foundry (closed in 1988 by owner Chrysler), the route then becomes parallel to and north of Exmouth Street as it dives under the Christina Street overpass and enters the City of Sarnia.

East of the Murphy Road underpass, the freeway curves to the northeast to bypass its original alignment. It crosses the Howard Watson Nature Trail, a mixed-use recreational trail that was converted from a Canadian National Railway (CNR) line in 1988. The highway curves back to its east–west orientation at an interchange with Highway 40 (Modeland Road). It passes south of Sarnia Chris Hadfield Airport before exiting the city limits at Mandaumin Road (Lambton Road 26).

Now parallel and north of London Line, the former route of Highway 7 (the predecessor route between Sarnia and London), the freeway jogs north to travel along the back lot line of farmland fronting London Line and the concession road north of Highway 402. The highway split at least one farm in half during its construction, with the family’s barn being burned down to make way for the construction. The freeway passes by a truck inspection station (eastbound traffic only) and truck rest area (westbound traffic only, formerly a truck inspection station) before being crossed by Camlachie Road. It meets Lambton County Road 21 (Oil Heritage Road), the northern terminus of the Oil Heritage Route, north of the town of Wyoming. The county road is also a former southern extension of Highway 21, which itself begins as Forest Road 9.3 kilometres (5.8 mi) to the east. Highway 21 is also known as the Bluewater Route, as most of its length is parallel to the shore of Lake Huron.

After passing an interchange with Forest Road, the freeway is crossed by London Line and momentarily diverges from its straight alignment to dip south of Warwick. It continues 25 kilometres (16 mi) east through large patches of farmland, then meets with Middlesex County Road 81 (Victoria Street) at an interchange as it passes north of Strathroy. Shortly thereafter it curves to the southeast and zig-zags towards London, bisecting farms and dividing woodlands. The freeway passes to the west of the town of Delaware and curves east. It enters London and meets interchanges with Highway 4 south of Lambeth, as well as with Wonderland Road before merging into Highway 401. Access to westbound and from eastbound Highway 401 is provided via Highway 4 or Wonderland Road.

The freeway generally uses Parclo A2 and Parclo B2 designs for interchanges. Exceptions include the Front Street interchange in Sarnia, which is a hybrid of a diamond and Parclo B2 interchange (previously a Parclo AB2 until the mid-2000s), and the Highway 40 interchange which is a Parclo B-4. There is presently no interchange using the full six ramp Parclo A4 layout (a common design on other Ontario freeways) on the entirety of Highway 402; although several interchanges do have five ramps, while the junction with Indian Road was previously a Parclo A4 until the directional ramp in the NW quadrant was removed and replaced with a signalized left turn in the late 1990s.

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