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Which surface can lengthen the stopping distance with anti-lock braking?

  • A.Ice, on which the very low friction means that a locked wheel would in any case stop the vehicle more quickly
  • B.Loose gravel or fresh snow
  • C.Wet tarmac, on which the reduced friction prevents the system from modulating the pressure quickly enough to help
  • D.Dry tarmac

Answer: B

A locked wheel builds a wedge of loose material ahead of it that helps to stop the vehicle, and anti-lock prevents that wedge forming. The trade is accepted because steering control is worth more. Some systems detect the surface and adapt. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking which component actually carries the load settles most questions of this kind at once. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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