Stopping Distances

30mph after drinking during wet weather

You had been drinking alcohol and driving in the wet so you hit the pedestrian. Even though you were driving at 30 mph, alcohol had slowed your reactions and increased your thinking distance. The wet road also increased your braking distance. This meant that you were not able to stop safely when the pedestrian stepped out unexpectedly.

Thinking Distance
15m
Braking Distance
18m
Overall Stopping Distance
33m

Injury: Yes, the car hit the pedestrian.

In this scenario, it is likely that half of the pedestrians hit would be injured, and 1 in 5 would be seriously injured or hospitalised.

Suggested Comparisons

  1. This accident would have been prevented if the driver had not been drink-driving. The driver took longer to spot and react to the pedestrian, because s/he was impaired by alcohol. This resulted in a longer thinking distance, which meant that it took longer to stop. Re-run the simulator, without selecting alcohol impairment, to see how the thinking distance is shorter, but note how the wet road still increases the braking distance.
  2. Using a mobile phone also increases the thinking distance as the driver takes longer to spot and react to the pedestrian. Re-run the simulator, and select mobile phone use instead of alcoholic impairment, to see how this changes the result.
  3. Wet weather increases braking distances. Re-run the simulator, and select dry weather, to see how this decreases the braking distance.

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