The Trans-Canada Highway
This plaque stands approximately at the halfway point of the Trans-Canada Highway, which runs from St. John's, Newfoundland, to Victoria, British Columbia. The highway's construction, in conjunction with the provinces, was authorized by the federal parliament in 1949. The official opening for through traffic of this 7,820 km route, of which about 2,338 km are within Ontario, took place on September 3, 1962. However, with the completion of a section of Highway 11 between Longlac and Hearst in 1944, it had been possible previously to cross Ontario from Quebec to Manitoba. The opening of the Trans-Canada Highway provided a shorter first-class route drawing together widely separated regions of Ontario.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.