Essentially an east-west spur of PTH 21, it provides access to the town of Alexander.

Provincial Road 455 is an east–west route and runs from PR 250 near Alexander to its terminus at PTH 21 just east of the Sioux Valley Dakota Nation along the banks of the Assiniboine River.

The speed limit along this road is 80 kilometres per hour (50 mph).

Prior to 1949, PR 455 was part of the original Highway 1.

[1] The route was given its current designation when the Manitoba government implemented its secondary highway system in 1966.