The final segment of Highway 43 between Whitecourt and Valleyview was officially completed in 1955 and a ribbon-cutting ceremony was held in the Iosegun River valley, approximately 20 km southeast of Fox Creek. The completion of the highway provided the south Peace Region of northwest Alberta, particularly Grande Prairie and Valleyview, with a more direct and significantly shorter route to Edmonton. It also slightly shortened the driving distance from Peace River to Edmonton once the Highway 34 realignment north of Valleyview was completed by 1959. An aggressive paving program began shortly after the highway was completed. Paving began northwest of Whitecourt and south of Valleyview. By 1960, the entire length of the highway was paved, which included a significant realignment between Whitecourt and Cottonwood Corner south of Blue Ridge and other minor realignments between Cottonwood Corner and Gunn to smooth out the highway's numerous jogs.