Ontario Highway 3A (Windsor) History - The King's Highways of Ontario

The second King's Highway 3A connected the Old Windsor Ferry Dock & Detroit-Windsor Tunnel in Downtown Windsor to Highway 3 in South Sandwich Township. Highway 3A was created out of a route renumbering in 1929. A new route for Highway 3 was assumed along Huron Church Line Road on July 10, 1929, connecting that route with the future Ambassador Bridge. The old alignment of Highway 3 leading into Downtown Windsor via Dougall Avenue became Highway 3A. Initially, Highway 3A only serviced the ferry dock in Downtown Windsor. On November 3, 1930, the Detroit-Windsor Tunnel opened to traffic, and Highway 3A began to serve this border crossing as well. In 1935, Highway 3A was renumbered as Highway 3B, a designation which this route retained until 1997. A different, unrelated Highway 3A existed in the Niagara Falls and Welland area between 1927 and 1970.