People driving between Grande Prairie and Grande Cache, Alberta, should prepare for slower trips starting January 20, 2026, as Alberta Transportation and Economic Corridors (Peace Region) begins daylight-only roadwork 12 kilometres north of Grande Cache to maintain the safety of the busy mountain route.
Construction will take place during daylight hours until February 2, 2026. Drivers will be required to slow to a posted 50 km/h through the work area; crews will use flaggers or temporary traffic signals to direct alternating one-way traffic through a single lane.
The project is essential maintenance to stabilize shifting slopes along the highway near the Grande Cache Fish and Game Association. Provincial project documents note there are no viable local detours in this mountainous area, so drivers should plan for extra travel time.
This stretch of Highway 40 is a major route for log hauling and oilfield services. Local coverage and Alberta Major Projects documentation say these repairs follow recent twinning and grade-widening projects intended to improve safety and industrial capacity on the corridor.
Grande Cache RCMP, local ambulance services and other emergency responders are listed among stakeholders and have been identified as needing to consider the operational impacts of reduced speeds and alternating lanes between Grande Prairie and Grande Cache.
Alberta Transportation says standard safety protocols — including the reduced speed limit, one-lane alternating traffic controlled by flaggers or temporary signals — will be used to protect roadside workers as the maintenance is completed before the peak of winter industrial activity.
