When is it allowed to drive in the left lane on a multi-lane highway?

Driving in the left lane on a multi-lane highway is primarily allowed when you are overtaking another vehicle or if the left lane is designated for turning left. This practice is in line with traffic regulations designed to maintain order and safety on highways. The left lane is generally reserved for faster-moving traffic and for vehicles that are passing slower vehicles in the right lane.

Using the left lane only for overtaking helps prevent congestion and promotes smoother traffic flow. When vehicles use the left lane to pass slower vehicles and then return to the right lane, it facilitates the movement of traffic without unnecessary delays. Similarly, utilizing the left lane for left turns further enhances traffic efficiency, as it provides a clear path for vehicles that need to make those maneuvers.

The other options present scenarios that do not align with safe driving practices or traffic laws. For instance, driving in the left lane at all times, except during traffic, could lead to dangerous situations if slower vehicles are present in the right lane. Driving in this manner does not account for the purpose of dividing lanes and could disrupt the flow of vehicles. Additionally, only using the left lane during peak hours or when there's a slow vehicle in the right lane is too restrictive and does not reflect the fundamental rules regarding lane