The Trans-Canada Highway is a federal-provincial highway system that joins all ten provinces of Canada. It is, after the Trans-Siberian Highway and Australia's Highway 1, the world's longest national highway, with the main route spanning 7,821 km. The system was approved by the Trans-Canada Highway Act of 1948, construction commenced in 1950, officially opened in 1962, and was completed in 1971. The highway system is recognizable by its distinctive white-on-green maple leaf route markers.
Throughout much of Canada, there are at least two routes designated as part of the Trans-Canada Highway. For example, in the western provinces, both the main Trans-Canada route and the Yellowhead Highway are part of the Trans-Canada system.