A safe following distance when driving in normal conditions at speeds of 30 mph or slower is:
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None of the choices.
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2-4 seconds.
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3-6 seconds.
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4 seconds.
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Explanation
When driving at speeds of 30 mph or below, maintain a following distance of two to four seconds between your vehicle and the one ahead. This gives you enough time to react and stop safely if traffic suddenly slows or stops, reducing the risk of a rear-end collision.
As your speed increases, or if road conditions become less favorable - such as in poor visibility, wet or slippery roads, or heavy traffic - you should increase your following distance to at least four seconds or more to maintain a safe margin.
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Other questions in the same category: Safe Following Distances
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This question appears in the following DMV practice tests: