Road fatalities are a major concern in modern society. The increase in the amount of road vehicles on public roads exposes more people to the dangers that come with road traffic. On highways, higher speeds are the cause of more serious crashes. To tackle this issue, active safety systems work in cooperation with passive safety systems to improve the occupants’ safety. In the assessment of new active safety systems, the availability of crashes for computer simulation is limited. This work is therefore aimed first at using lead-vehicle-braking events from the highD naturalistic driving dataset as a basis for creating “what-if” crashes.