What's your top speed?

Well that's hardly a smiley face 30mph sign is it?

You are talking about a different type of sign. The 30mph ones (at least the ones I ride past) have no radar in them - they are simply a flashing sign. The ones that say "You are doing xxMPH" well gee wizz I reckon they might just have a radar in them..

This sign had a smiley face and the speed displayed. So it is completely a smiley face 30mph sign in my book.

Http://traffictechnology.co.uk/images_x/sidsmile.jpg