If you hit a pedestrian with your car at 50 km/h, the risk of the pedestrian being killed is 80%.
If you hit a pedestrian or another unprotected road user with your car, your speed is absolutely decisive in the consequences for the accident victim. If the collision takes place at 30 km/h, the risk of the road user being killed is 10%. If the collision takes place at 50 km/h, however, the risk increases to 80%.