In 1959, the Spadina Expressway became part of the Metro official transportation plan. The original plan intended to connect a "Highway 403 bypass" in the vicinity of today's Highway 407 in the city of Vaughan south through the borough of North York, just east of Downsview airport, then south between Dufferin Street and Bathurst Street as far south of Eglinton. The highway would have gone into a ravine as far south as St. Clair Avenue through the borough of York. It would then enter Toronto proper, going directly south through the Annex neighbourhood, connecting to an east-west "Crosstown Expressway" south of Dupont Street, and ended at the intersection of Bloor Street and Spadina Avenue. Spadina Avenue would be reconstructed with express lanes in the middle all the way south to the waterfront.