When is it lawful to drive in the left lane on a multi-lane road?

Driving in the left lane on a multi-lane road is generally considered lawful when passing another vehicle. This rule is in place to maintain smooth traffic flow and ensure safety on the road. The left lane is typically reserved for faster-moving traffic and overtaking slower vehicles. When a driver needs to pass another vehicle, using the left lane allows for a more efficient and safe maneuver without disrupting the flow of traffic in the right lane.

In many jurisdictions, including Alberta, it's important for drivers to return to the right lane after completing the pass unless there is a valid reason to remain in the left lane. This practice helps to prevent unnecessary congestion and promotes a safer driving environment.