What is the mortality rate for pedestrians who get hit by a car driving at 30 km/h?
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“Nine out of ten people will survive being hit by a car at 30 km/h. However, when that speed is increased to 50 km/h, the risk of a fatal accident increases eightfold” (Swedish Transport Administration)
The important thing is that you are aware that the speed greatly impacts on the chances of a pedestrian surviving being hit by a car. Specifically, you should know that 30 km/h = great chance of survival and 50 km/h = small chance of survival. This is so that you will understand why the speed limit on some stretches of road is 30 km/h.
The difference between the different alternatives is normally great enough that you do not need to learn any exact figures or formulas.
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