High Quality Content by WIKIPEDIA articles! The Trans-Canada Highway is a federal-provincial highway system that joins the ten provinces of Canada. It is, along with the Trans-Siberian Highway and Australia's Highway 1, one of the world's longest national highways, with the main route spanning 8,030 km (4,990 mi). 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.