Left-lane driving sparks some of the biggest frustrations on Michigan highways, and state law makes clear when motorists can — and can’t — cruise in that far-left lane.

So-called “left lane squatters,” drivers who stay in the lane instead of using it to pass, can face civil infractions if their speed impedes traffic. Police and traffic experts say it’s not just an irritation, it’s a safety issue that leads to backups and crashes when others swerve to get around them.

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