In the 1920s, the Province of Ontario's Department of Public Highways of Ontario (DPHO, the predecessor of today's Ministry of Transportation) decided to start numbering its roads. This road would gain the designation of Highway 18. in 1929, when the Ambassador Bridge opened, this road was renamed Highway 2A, and was intended to bring travellers into downtown Windsor (and eventually to the Detroit-Windsor Tunnel), while Highway 2 (which had absorbed the original routing of Highway 18 along modern day County Road 42), would lead people into downtown Windsor. Highway 3 would travel down the newly built alignment leading to the bridge. This road was renamed Highway 98 in 1938.