What determines who is at fault in a multi-vehicle collision?

What the Law Says

Canadian tort law does not have a single federal statute that defines fault in multi-vehicle collisions. Instead, liability is grounded in the common law principle of negligence, applied through provincial highway traffic acts and civil liability legislation. Courts assess whether each driver met the standard of care expected of a reasonable person in the circumstances.

There is no federal statute that sets out a formula for assigning fault in multi-vehicle crashes. Instead, provinces rely on general negligence principles and their own traffic legislation — such as Ontario’s Highway Traffic Act or British Columbia’s Motor Vehicle Act — to establish rules of the road that inform the standard of care.

The foundational legal test is whether a driver’s conduct fell below the level expected of a reasonably prudent driver in similar circumstances. This includes obeying traffic signals, maintaining proper following distance, adjusting for weather or visibility, and anticipating hazards.

What Courts Have Said

The Supreme Court of Canada has clarified how courts should evaluate and divide fault when more than one driver contributes to a collision.

What to Do

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