All signs point to Potton
Earlier today I saw a picture of a small roadsign somebody had made for their layout. A quick bit of research, and I found a remake of the font Transport, as used on the real UK roadsigns.
I played around a bit with Inkscape, Xara, and Microsoft Expression Designer. I had some issues with the colour palettes in Inkscape, so tried Xara, which I just don’t like. Expression Designer crashed out changing a colour. The latter two I got free; Xara from a magazine cover CD, and Expression Designer I got under one of our licensing schemes at work.
I tried Inkscape again, and finally managed to convince it to do what I wanted. I made up a custom colour palette, using a Department for Transport guide to road signs as a reference.
I dug around and found a good picture of a roadsign, which I used as a reference, and got to work drawing up my sign:
It looks pretty good! The original is here on the Mid Beds website.
Inkscape is a very good piece of software, and great for drawing things like this. It has a few bugs, but a new release it just round the corner and should address them.