What is the rule regarding driving in the left lane on a multi-lane highway?

The left lane on a multi-lane highway is designated primarily for passing. This means that drivers are expected to use the left lane to overtake slower-moving vehicles in the right lanes and should return to the right lane when it is safe to do so. This rule is in place to maintain the flow of traffic and to minimize congestion, as having vehicles lingering in the left lane without an intent to pass can lead to bottlenecks and frustration for others on the road.

Staying in the left lane unnecessarily can impede drivers who are attempting to pass or travel at higher speeds, thus the expectation is for drivers to utilize that lane only for passing maneuvers and then promptly return to the right lane. This rule encourages safer driving habits and more efficient use of highway lanes, ensuring that each lane serves its intended purpose.