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Which benefit does anti-lock braking give beyond shorter stops?

  • A.Steering control is retained during heavy braking
  • B.A shorter stopping distance on every surface, which is the principal reason such systems are fitted to vehicles
  • C.Reduced pad wear
  • D.Automatic application of the brakes when an obstacle is detected ahead of the vehicle during ordinary driving

Answer: A

A rolling tyre generates lateral force and a locked one does not, so the driver can steer around an obstacle while braking hard. On gravel or fresh snow the system actually lengthens the stop, which is why the first claim is qualified. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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