Severe Injuries
The severity of injuries suffered in crashes will vary depending on many factors, such as speed, whether or not the victim was wearing a seatbelt, whether an object (such as a tree or other vehicle) was hit and the design of the vehicle. However, although vehicle design has come a long way and can help reduce injuries suffered in crashes, no amount of innovative design can totally eradicate injury or death from high-speed collisions.
Pedestrians are also particularly vulnerable and speed really matters in crashes involving them - the risk of a pedestrian dying when hit by a car rises sharply above 30mph. Indeed, information published by the Department for Transport in 2010 indicates that the risk of death is approximately four times higher when a pedestrian is hit at 40mph than at 30mph.
So no one should be in any doubt that 30mph limits protect pedestrians, and that to speed through built-up/residential areas puts lives at risk.