Stopping distance is affected by a number of factors, including load, condition of the road surface, tyres, brakes, driver reaction times and design and type of vehicle.

Speed	Thinking Distance (Metres)	Braking Distance (Metres)	Total Stopping Distance (Metres)
20mph	6m	6m	12m
30mph	9m	14m	23m
40mph	12m	24m	36m
50mph	15m	38m	53m
60mph	18m	55m	73m
70mph	21m	75m	96m

These figures assume dry weather and good tyres and are based on an average family car. However good a driver we think we are or however good our car’s ABS is, driving over the limit means it takes much longer to stop and the chances of causing a fatal collision are greatly increased.