Where I live there is a 9ft 6in clearance under a railway line bridge. The warning signs, the sensors, flashing lights etc. still do not stop drivers colliding with it. It gets hit about once a week and the local police have stopped treating it as an accident, it is now a careless driving charge. Every time the bridge is hit the rail company shut the line. It causes chaos. High vehicles use a 'level crossing' to cross the tracks and they they regularly drive through the barriers. Once again, the line gets closed. Google Ely Cambridgeshire UK streetview and see for yourself.

William