In towns and cities, a pedestrian's chances of survival are significantly higher when the vehicle is travelling at:
En español: En poblaciones, las posibilidades de supervivencia de un peatón son significativamente mayores cuando el vehículo circula:
Why this is the correct answer
Statistics show that the probability of a pedestrian's death decreases dramatically with vehicle speed. Below 30 km/h, most pedestrians survive; at 50 km/h or more, the risk of death is very high.