Alberta Provincial Highway No. 501 is a highway in the province of Alberta, Canada. It runs west-east from Highway 5 east of Mountain View as gravel to Cardston, then pavement through Del Bonita and Milk River to Highway 879, then gravel again to the Saskatchewan border.It is also known as 9 Avenue in Cardston, and Centre Avenue in Milk River. From Highway 887, on through to Saskatchewan, it follows the path of the Red Coat Trail.