When is it permissible to drive in the left lane of a multi-lane highway?

Driving in the left lane of a multi-lane highway is primarily intended for passing slower vehicles. This practice helps to maintain a smooth flow of traffic and ensures that faster-moving vehicles can overtake those that are moving at a slower pace. The left lane is generally designated as the lane for higher-speed travel, which is why it is considered appropriate to use it for passing.

When following this guideline, it’s important to ensure that you only enter the left lane when it is safe to do so and that you return to a right lane after completing your pass. This rule helps to minimize congestion and enhances overall road safety by preventing unnecessary lane changes and providing a clear passage for faster drivers.

The other choices suggest scenarios that do not align with safe driving practices. Driving in the left lane at any time could lead to unsafe situations if drivers are not actively passing. Utilizing the left lane only during the day does not consider visibility and safety issues that can arise during nighttime or adverse weather conditions. Lastly, driving in the left lane just because there are no cars around may encourage misuse of the lane and can lead to problems if a need to return to the right lane suddenly arises.