Stopping Distances

40mph after drinking during dry weather

You were driving too fast and had been drinking, so you hit the pedestrian.

The excessive speed increased both your thinking distance and braking distance. To make matters worse the alcohol impaired your judgement and increased your thinking distance further. This meant that you were not able to stop safely when the pedestrian stepped out unexpectedly.

Thinking Distance
20m
Braking Distance
24m
Overall Stopping Distance
44m

Injury: Yes, the car hit the pedestrian.

In this scenario, it is most likely that the pedestrian would be killed. Only one in every ten pedestrians would not receive a serious or fatal injury.

Suggested Comparisons

  1. Speed increases both the thinking distance and braking distance. Although the alcohol meant that in this instance, a lower speed would not have avoided the collision, you can re-run the simulator at different speeds to see how much the stopping distance increased or decreases.
  2. Using a mobile phone also increases the thinking distance meaning that the driver takes longer to spot and react to the pedestrian. Re-run the simulator, and select mobile phone use instead of alcohol impairment, to see how this changes the result.
  3. Wet weather increases braking distances. Re-run the simulator, and select wet weather, to see how much the braking distance is increased and how this changes the result.

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