(17 Apr 2016, 6:19 pm)James101 wrote Surely if the bus fits, it will always fit; so no need no take caution? I'm not aware of any bridges that shrink or buses that suddenly grow taller. 

I'm not sold on this system being a good thing. either the noise from the false alarms becomes distraction or the opposite where the drivers hear it so much they begin not to take notice; even when the alarm would be useful.

A bus is sent on a diversion by lets say the Police due to a road closure (which has happened), and they did not think of a low bridge somewhere on the diversion, surely its a good thing to have something like Low Bridge Warning fitted.

I cannot believe that people think having such a device fitted is a waste of time.