In the described chain crash where a vehicle hits two others in sequence and there is a single stabilization point, how many crashes occurred?

• A. One crash because there was only one point of stabilization
• B. Two crashes because the sequence includes multiple impacts
• C. Three crashes
• D. No crashes

Answer: (A)

The key idea is how a crash event is counted. If multiple impacts happen but the energy from those impacts is absorbed and the vehicles settle into one motionless system at a single moment, that entire sequence is treated as one crash. In this scenario, a vehicle strikes two others in sequence, yet there is only one stabilization point—meaning the chain of impacts is part of one continuous incident and the system comes to rest in one moment. Therefore, it’s counted as a single crash.

If there were distinct stabilization moments separated in time (or if the sequence created separate, independent energy-dissipation events), you’d count more crashes. But with one stabilization point, one crash is the correct understanding.