The Nuns' Island detour bridge will open in the fall, according to The Jacques Cartier and Champlain Bridges Incorporated.

Construction of the bridge began in August 2013. The structure will allow the agency to close the existing Nuns’ Island Bridge for construction, which is planned as part of the replacement of the Champlain Bridge.

The agency says the new seven-lane-wide bridge will improve traffic in the Champlain Corridor.

Six lanes — three lanes in each direction — will be used for regular traffic while the seventh will be reserved for buses.

The lane will stretch approximately one kilometre and will allow buses to avoid traffic from Highway 15 and the Turcot Interchange.

A bike path will also be integrated into the structure. It will be 2.5 metres wide, which is comparable to that of the Jacques-Cartier Bridge.

The configuration of the new bridge will also remove a traffic light, which the agency says should improve circulation towards Montreal during the evening rush hour.