 The Western provinces have voluntarily coordinated their highway numbers so that the main Trans-Canada route is designated Highway 1 and the Yellowhead route is designated Highway 16 throughout.East of Manitoba the highway numbers change at each provincial boundary, or within a province as the TCH piggybacks along separate provincial highways (which often continue as non-TCH routes outside the designated sections) en route.In addition, Ontario and Quebec use standard provincial highway shields to number the highway within their boundaries, but post numberless Trans-Canada Highway shields alongside them to identify it.