with its western terminus at the intersection of Highway 8 (Main Street) and Highway 6 (John Street) in downtown Hamilton. It proceeded south along John Street, concurrently with Highway 6, to the foot of the Niagara Escarpment, where the two routes split. Highway 20 climbed the escarpment through the Jolley Cut, while Highway 6 used the Claremont Access. At the top, Highway 20 proceeded east along Concession Street, then south along Upper Gage Avenue to Rymal Road. From there, the route turned east and followed Rymal Road to Elfrida and onwards to its eastern terminus at the Honeymoon Bridge Niagara Falls.