In message , at
19:19:06 on Sat, 19 Feb 2005, Martin Underwood
remarked:
Yeah, or perfectly good roads into Brighton, quite safe at 40 mph,
suddenly turning into 30 mph without even telling you until you get
flashed & penalty points (this one's a very sore point in our family!).

Presumably there must be 30 signs to make the speed limit enforceable, but
they may not be very obvious.

What has happened in some places is they've removed a section of "40"
road, between two sections of "30". So you don't have a 30 sign to miss
seeing.

Sometimes they'll put up signs saying the road is no longer 40, but
sometimes they won't.

--
Roland Perry