You are passing a 14-metre long bus on a sunny day in May. Just as you pass the rear of the bus, a child runs out in front of the bus. What is the maximum speed that would allow you to stop in time, if you react within 1 second?
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First, consider the calculations of stopping distance, reaction distance and breaking distance.
A “sunny day in May” = assume that the condition of the road is normal/good.
You must try the different options. 70 km/h feels like it is too fast. 30 km/h seems more reasonable. Try 30 km/h first:
Reaction distance:
Braking distance:
Stopping distance:
Speed | Stopping distance |
70 km/h | 40.6 metres |
50 km/h | 25 metres |
30 km/h | 12.6 metres (closest to 14 metres) |
20 km/h | 7.6 metres |
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