Closing speed is often used to explain the potential damage that could be caused by two vehicles having a head on collision. If vehicle A is doing 60mph and vehicle B is doing 60mph then the closing speed would be 120mph.
120mph can be given as a rough example to emphasise the dangers, though other factors would have to be taken into consideration to provide an exact closing speed, such as:
- Angle of the two vehicles on impact
- Vehicle types – if vehicle A is a lorry and vehicle B is a Mini Cooper, vehicle B would suffer more
- Where the vehicles finished after the collision