Who cleans up the debris after freeway crashes?

Q. Dear Honk: How come the accident cleanup crews on the freeways sometimes leave automobile bumpers behind? I drove the 405 Freeway recently and saw three bumpers by the center divider where there had been an accident.
– Bill Coulson, Laguna Niguel
A. Not sure about that trio of bumpers, Bill, but Honk, with the help of a frequent column contributor, can explain what is supposed to happen.
When a vehicle crashes, the responding tow truck is supposed to clean up all of the debris and take