Any time a driver wants to merge with other traffic, they should:
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Look for a four-second gap.
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Merge only when other drivers have come to a complete stop.
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Merge as fast as possible.
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Wait until their lane ends before merging.
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Explanation
When merging with traffic or changing lanes, you should always look for a four-second gap. This ensures a two-second following distance for both you and the vehicle behind you, allowing enough space for safe merging. Avoid merging into small gaps, as they can quickly become dangerous if the vehicle ahead slows or stops suddenly.
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This question appears in the following DMV practice tests: