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Simple things like that, definitely. But you then get the usual question of whether everyone would notice them, or be able to interpret the information quickly enough. As we have seen from videos taken at fords, many people don't even stop before ploughing through. I mean, I consider fords not to be a major problem, as local people tend to know about them, but in serious flood events, careless drivers could be swept away.
Oliver Schick
Near where I grew up there was a ford with a very helpful height guide sign to show the depth. They were installed after a tragic accident there once. I can't help thinking that installing these in underpasses would be a relatively simple cost effective way of showing the depth. Maybe in metric too.