I’ve seen this back home in Winchester and I’ve seen lots of discussion threads because of it out here in CA.  Still can’t find a solid reason for it.  Why a 14 mph speed limit?

1. It’s different and catches your attention
2. 15 mph is too fast (and sounds too much like 50 when spoken with certain accents)
3. 13 mph is too slow (and unlucky)
4. 14 is a multiple of 7 so it’s twice as lucky
5. 14 mph is the speed of a horse-driven carriage at a “furious” pace
6. The trams travel at 15 mph so theoretically a car should never overtake a tram

And so on and so on and so on.  I tend to fall into the reason #1 group, but I like them all.