I once entered a bridge on a corner and couldn't see the other side, I went in slow incase another boat was approaching so they could use the horn back at me. Instead I was forced out of the bridge up onto rocks the other side, had a man shout at me for not looking where I'm going and left me stranded. That was on the Llangollen. At first I felt ashamed but only other option to have prevented it would have been to tie up the boat and walk through the bridge to check its clear.... not sure if that would be going to far though.