I often see a "DO NOT PUSH" sign on the back of trucks (I believe they have all been large semi-trailer dump trucks). I've even seen "YOU PUSH IT YOU OWN IT" signs on a few. This raises two questions for me:
- Why would someone want to push on the back of a truck?
- Why would the truck owner NOT want someone to push on the back of his truck?
(Just to be clear: I'm assuming that the "push"ing would be done by another truck, NOT by a person leaning on the back.)
Edit: I just saw a "DO NOT PUSH" sign on a non-semi dump truck: no hitch involved.