Low Bridges

Does any one know of a database that lists low (and weak) bridges. Surely it would be in the interests of the Highways Agency or Network Rail to list where they are even if it only saves the occasional bridge strike. I have seen the AA map but find the detail lacking compared to a Navigator map. The Satnav systems don’t seem to be able to avoid the POI’s and as I move plant I am always running at different heights.