From CHiPs Online:
After the CHP shows up at the accident scene, Getraer strictly orders everyone to not touch anything until after MAIT does an investigation. He is standing on the inside of one of the burned out cars (as if he is ready to get in it) rapping his fingers on the door. He then walks around the open door, leans against the front fender, and raps his fingers on the front fender as well.