What is the recommended lane usage on a typical multi-lane highway?

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On a multi-lane highway, the left lane is the passing lane. The best practice is to use it for overtaking slower vehicles, and then move back to the right after you’ve finished passing. The right-hand lanes are for through traffic and normal driving, so staying there helps the overall flow and makes it easier for others to merge or pass if needed. This keeps traffic moving smoothly and reduces weaving and sudden lane changes. The other options don’t fit that flow: staying in the left lane constantly can cause congestion and may be illegal; using the middle lane for through traffic is not the standard expectation and can create unnecessary lane changes; and always driving in the rightmost lane regardless of traffic can force you to travel well below the flow or cause unsafe interactions with merging vehicles.