Stopping Distances

40mph while using a phone during dry weather

You were driving too fast and using a mobile phone, so you hit the pedestrian.

The excessive speed increased both your thinking distance and braking distance. To make matters worse using a mobile phone distracted you, increasing the time it took to spot, and react to, the pedestrian. This meant that you were not able to stop safely when the pedestrian stepped out unexpectedly.

Thinking Distance
26m
Braking Distance
24m
Overall Stopping Distance
50m

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 suffer a serious or fatal injury.

Suggested Comparisons

  1. Speed increases both the thinking distance and braking distance. Although the use of a mobile 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. Drinking alcohol also increases the thinking distance meaning that the driver takes longer to spot and react to the pedestrian. Re-run the simulator, and select alcoholic impairment instead of mobile phone use, 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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