Ontario Highway 3B

King's Highway 3B
View looking north on Ouellette Avenue, a former part of Highway 3B
Route information
Maintained by City of Windsor
Length	11 km[citation needed] (6.8 mi)
Existed	1935–1998
Location
Country	Canada
Province	Ontario
Counties	Essex
Highway system
Ontario provincial highways Current Former 400-series
← Highway 3 → Highway 4

King's Highway 3B, commonly referred to as Highway 3B, was a provincially maintained highway within Windsor, in the Canadian province of Ontario. Its purpose was to link Highway 3 and Highway 401 with the Detroit–Windsor tunnel and downtown Windsor. Highway 3B was routed along the city streets of Ouellette Avenue, Ouellette Place, Howard Avenue, and Dougall Avenue.