Head wrap distance (HWD)
Definition
The distance along the vehicle's body surface from the primary contact point (usually the bumper) to where the pedestrian's head first contacts the vehicle. Combined with the vehicle's frontal geometry, HWD informs the speed calculation in the Pedestrian Impact Reconstruction method.
Related terms
- Conspicuity
- The degree to which a pedestrian or cyclist is detectable against their background under the prevailing lighting conditions. It governs the detection...
- Fender vault
- A variant in which the pedestrian contacts the vehicle's fender rather than the front face, resulting in a lateral throw to one...
- Throw distance
- The horizontal distance from the point of primary vehicle-pedestrian contact to the location where the pedestrian comes to rest. Combined with pedestrian...
- Vault impact pattern
- A pedestrian impact sequence typical of high front-end vehicles (SUVs, trucks): the pedestrian is struck in the torso or pelvis, the body...
- Wrap impact pattern
- A pedestrian impact sequence typical of passenger cars and low-profile vehicles: the lower limbs are struck, the body rotates forward and upward...
Explained in
- Pedestrian and Cyclist Collision AnalysisThe distance along the vehicle's body surface from the primary contact point (usually the bumper) to where the pedestrian's head first contacts the vehicle. Co...