there is a good chance that the accident will not take place. In other words, less accidents means a safer behaviour of the road user, safer vehicles and safer traffic infrastructure; for example through improved education, better driver skills or more experience of the road users; better road design causing less conflicts for the road users; safer vehicles with increased visibility or better brakes, etc. The safe operation of the interfaces between these elements is as important as the intrinsic safety of the road user, vehicle, and environment as such.