Alberta Provincial Highway No. 1A is the designation of two alternate routes off the Alberta portion of Trans-Canada Highway 1. However, it is not the only name used for spurs off Highway 1 - Highway 1X is another such designation. Despite these highways being suffixed routes of Highway 1, they are not part of the Trans-Canada Highway network, and are signed with Alberta's provincial primary highway shields instead of the Trans-Canada shields used for Highway 1.

16 Avenue N is a major road in Calgary, Alberta, that forms a 26.5-kilometre (16.5 mi) segment of Highway 1 and connects Calgary to Banff and Medicine Hat. It is a four to six-lane principal arterial expressway at its extremities, but is an urban arterial road between the Bow River and Bowness Road, and also between Crowchild Trail and Deerfoot Trail. Due to Calgary's quadrant system, it is known as 16 Avenue NW west of Centre Street and 16 Avenue NE to the east.