Conceptor of:
- Chartrand ruler : Equipement used to measure deformation due to crash on a vehicule.
- Chartrand marker : Measuring equipement used to determine the braking distance after a crash.
- Chartrand Trajectory indicator: measuring equipement used to determine the trajectory of vehicules after a crash. Yaw, Braking, Sliding, Slipping, eliminating non implicated vehicules.
- Friction test sled : Measuring equipement used to determine friction coeficient of the braking strips after a crash.