Detecting vehicle crash

I’m using chaos vehicle in my game which follows a spline, all working fine, occasionally the vehicles will crash into each other or a static mesh (wall), then they keep trying to go forward and stay there. My question is, what is the best way to detect when the vehicle is stuck so I can set the vehicle to reverse etc?

Surely there’s someone that’s done this before? Any help is appreciated.

Did you ever figure this out?