What is the proper use of the left lane on a multi-lane highway?

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The left lane on a multi-lane highway is the passing lane. It’s intended for overtaking slower traffic ahead, not for cruising at your preferred speed. After you’ve passed the vehicle, move back to the middle or right lane when it’s safe to do so. This keeps traffic flowing smoothly and prevents the left lane from becoming a slow, blocked lane. When you do move back, signal and check your mirrors and blind spots. The other lanes are for regular travel, and the left lane isn’t for trucks only or for staying in while not passing. Using the left lane only to pass and then returning to the other lanes is the best practice.