Quebec's Ministry of Transportation hopes to have a bypass ready by Friday around a giant sinkhole on Highway 148 west of Gatineau.
On Wednesday morning, a portion of the road collapsed in Luskville, Que., between Nugent and Alary roads.
Water in a culvert below was blocked on one side and heavy rain caused the erosion, leaving a sinkhole that's10 metres wide by 10 metres deep.
The temporary single-lane bypass would be on the shoulder of Highway 148 around the sinkhole.
Motorists must currently use Highway 105 and Highway 366 as a northern detour to connect with Chemin Eardley, or if coming to Quebec through Ontario, drivers must take the ferry at Fitzroy Harbour. All of those paths could add an hour to some commutes.
Ministry spokeswoman Karen Sauvé said the priority is to create a quicker detour.
The complete fix of the highway sinkhole and the culvert is expected to take four to six weeks, Sauvé added.