Prompted to do an image search by something my father said about old roadsigns being in BLOCK CAPITALS, and all new ones being in Lower Case With Capitals.... I found this free to download set of 'Transport' fonts http://www.cbrd.co.uk/fonts/ including pre and post 1964 roadsigns, 'Motorway', and the elongated letters as used to put 'SLOW', etc, on the road surface.
This is the pre '64 font for example:
I thought some of you might be interested. Happy Modelling!