Highway 18 is a highway in the Canadian province of Saskatchewan. It runs from Highway 13 near Robsart, approximately 65 km (40 mi) east of the Alberta border, to the Manitoba border near Gainsborough, where it becomes Highway 3. It passes through three major communities, all in the eastern quarter of Saskatchewan – Estevan, Oxbow, and Carnduff; it also passes north of the west and east blocks of Grasslands National Park. Highway 18 is about 712 km (442 mi) long, which is the longest east-west highway and second longest highway in Saskatchewan.

Highway 13 is a highway in the Canadian province of Saskatchewan. It runs from the Alberta border until it transitions into Highway 2 at the Manitoba border near Antler. Highway 13 is about 676 km (420 mi.) long. Highway 13 passes through Shaunavon, Assiniboia, Weyburn, Redvers and Carlyle. It is also referred to as the Red Coat Trail, as much of its length follows the route of the original historic path. A majority of the route between Wauchope and Govenlock going through the Palliser's Triangle is also referred to as the Ghost Town Trail.