A move over law is a law which requires motorists to move over and change lanes to give safe clearance to law enforcement officers, firefighters, ambulances, and in some cases, tow-truck drivers. In the past, Canada and United States have used this term to apply to two different concepts; however, this is beginning to change as Canadian provinces have begun expanding the scope of their move over laws.
In Canada, move over laws require motorists, upon noticing an incoming emergency vehicle (coming from any direction) with sirens or flashing lights operating, to move to the farthest right lane/shoulder and stop, until the vehicle has passed the vicinity. This gives emergency vehicles a clear roadway for responding to emergencies, encouraging the fast response of emergency vehicles.
The Province of Ontario's Ministry of Transportation and the Province of Saskatchewan's Ministry of Highways and Infrastructure were the first to implement move over laws.Quebec was the last province to implement a move over law, which came into effect on August 5, 2012.
In 2005, the government of Alberta expanded the scope of the province’s move over laws. Amendments were made to the province’s Traffic Safety Act to require drivers to either slow down or move over when passing emergency vehicles or tow trucks stopped on the side of a highway when their "flashing lamps are operating." The maximum speed for passing stationary emergency vehicles or tow trucks was set at 60 kph, and the fines for exceeding that speed were doubled.
In 2012, Quebec established a Move Over Law (called in French as Corridor de sécurité, or Safety corridor). Unlike other laws found in US states and Canadian provinces, the Quebec law had broader application. Drivers would have to slow down and provide a buffer lane to a stopped service vehicle with active strobing/rotating lights or active traffic arrow. The service vehicles may be tow trucks, emergency vehicles (ambulance, police, fire), or highway department patrol vehicles.
In 2015, Ontario modified the Highway Traffic Act, stating motorists shall slow down and proceed with caution, moving over if multiple lanes exist, when approaching stopped tow trucks producing intermittent flashes of amber light. The section does not define tow trucks as "emergency vehicles".