It is currently 49 km (30.4 mi) long and services the direct north of Montreal's Metropolitan Area.

A-25 begins at an interchange with A-20 and Route 132 in Longueuil and quickly enters the Louis Hippolyte Lafontaine Bridge-Tunnel into the east end of Montreal.

It is the main north-south freeway in the east end of Montreal (actually northwest-southeast but perpendicular to the St. Lawrence River).

The $207-million project will save some $226 million for the province since a private consortium will assume any cost overruns.

Environmental organizations have raised concerns that the highway extension will lead to an influx of automobiles entering Montreal and increase development pressure on agricultural land in Eastern Laval.