Alberta Provincial Highway No. 1, commonly referred to as Highway 1, is a major east–west highway in Southern Alberta that forms the southern mainline of the Trans-Canada Highway. It runs from the British Columbia border near Lake Louise through Calgary to the Saskatchewan border east of Medicine Hat. It continues as Highway 1 into both provinces. It spans approximately 534 km (332 mi) from Alberta's border with British Columbia in the west to its border with Saskatchewan in the east. The route is a divided 4-lane expressway throughout the province with the exception of a section in central Calgary where it is an arterial thoroughfare and Urban Boulevard carrying 4 to 6 lanes. The highway is a freeway between the Sunshine exit near the town of Banff and Home Road in Calgary. Other rural sections have at grade intersections with Interchanges only at busier junctions. Twinning of the final 8.5 km (5.3 mi) of Highway 1 between Lake Louise and the British Columbia border was completed by Parks Canada and opened to traffic on June 12, 2014 making the whole length of Alberta Highway 1 a divided minimum 4-lane route. From Wikipedia
