Great Britain Theory Test Coach
Speed and safety marginsQuestion 237 of 424

You drive in slow-moving traffic. What should you do about the gap in front?

  1. Never get so close that you cannot stop safely
  2. Close right up to the bumper
  3. Leave a gap of one car length at most
  4. Change lanes to the left to overtake
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Correct answer: Never get so close that you cannot stop safely

You may reduce the gap a little to keep traffic flowing, but you must still be able to stop safely.

Source: The Highway Code (Department for Transport, GOV.UK), General rules, techniques and advice for all drivers and riders (103 to 158), Rule 151

Practice speed and safety margins

Questions last reviewed: 18 October 2026