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the practice of preventing another driver from changing lanes. specifically, when a driver wants to change lanes while through-travelling, but finds himself stuck behind slower traffic, he may wish to pass the other vehicle. a lane blocker, however, will find a way to keep the passing driver stuck in postition, making it impossible for the passing driver to get around safely. usually this is a passive action, as opposed to on-ramp blocking or offramp blocking; often the offending driver is unaware of the faster car wanting to go past (often because the offender is talking on a cell phone.)
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