At Waubaushene, the Trans-Canada Highway designation continues north along Highway 400 towards Parry Sound and Sudbury, while Highway 12 continues west towards Victoria Harbour, Port McNicoll, and the Martyrs' Shrine.
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The mostly rural route travelled through the towns of Whitchurch-Stouffville, Goodwood, and Uxbridge on its east–west path between Highway 48 and Highway 12.