Originally, Highway 4 started its course in Selkirk, down what is now PTH 9. The highway entered Winnipeg as Main St, sharing the highway's course with Route 52. At Portage Ave the highway turned right, sharing the highway's course with Route 85. Highway 1 merged on to Portage Ave from Broadway and continued along the same course out of Winnipeg.
In the late-1980s, Highway 4 was extended to connect PTH 59 to serve the needs of those travelling to and from Grand Beach. In the mid-1990s, Highway 4 between Selkirk and Winnipeg was renumbered PTH 9, and an old section of Highway 9 was renumbered PTH 8 and PR 230. The only remaining portion is between PTH 9 and PTH 59, the section of the route that was extended in the late 1980s. The speed limit on the route is 90 km/h (55 mph).