If we could use one unit for distance, height, width, length etc on our roads?
The following sign:
displaying information in 4 different units (yd, ft, in, m) would be replaced, if we changed over to metric, with a sign like this:
with only one unit, the metre. Yet it contains exactly the same information.
Motorists have to take in a lot of information at one time (far too much according to a recent RAC report) from road signs and other sources.
The least we could do is make things easier wherever we can!