King's Highway 402, commonly referred to as Highway 402 and historically as the Blue Water Bridge Approach, is a 400-series highway in the Canadian province of Ontario that connects the Blue Water Bridge international crossing near Sarnia to Highway 401 in London. It is one of multiple trade links between Ontario and the Midwestern United States. It is four lanes for much of its length, though the approach to the Blue Water Bridge is six lanes. 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. 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