Spotted...

Don't know about that, sometimes I ride behind a bus and my front wheel is touching the bumper, leaving a mark on a bus. There might be a problem if he does an emergency stop, which happens very rare.
But it does happen.

I am with dimi on this. If I could I would.

Matt Seaton made me do it.
Please don't.

A friend became very intimate with the back of a bus a few years ago whilst going round E&C. He's lucky to be able to tell the tale. Some impressive facial scars to this day.