When is it permissible to drive in the left lane on a highway?

Driving in the left lane on a highway is primarily intended for the purpose of passing other vehicles. This promotes a smoother flow of traffic, as the left lane is designed for faster-moving vehicles to overtake those traveling at slower speeds in the right lane. When a driver is preparing to pass a vehicle, they should move into the left lane, and once the passing maneuver is completed, they are expected to return to the right lane to allow others to use the left lane for passing as well.

The other scenarios typically do not justify using the left lane. For instance, heavy traffic may require vehicles to remain in their lanes rather than weaving back and forth. Traffic signals generally pertain to lane changes rather than lane usage on highways, and construction signs often indicate restrictions or recommended behavior that would not typically include moving to the left lane without specific justification related to passing. Understanding the proper uses of the lanes enhances safety and efficiency for all drivers on the highway.