LOL!
Ah good, you can see it. :)
*The following is Moosie talking to the keyboard* :
That is an actual road sign.
The colour and font follow a scheme that provides some information without writing a thing. Blue background, Motorway info. Green Background, Main road info. White background ,either immediate information or local information. Brown, Tourist info.
On a Motorway you encounter all three in sequence. Blue ,Green, white and Brown.
The Font is used on all signs. It was designed by a lady in the 60s for the new Motorway network. Ridiculously easy to read even at speed.