Absolute waste of money, nothing smart about them. Outdated information slowing cautious drivers down. Sign says 40Mph even though I there was an accident ahead 4 hours ago. Variable speed limits with cameras = Easy way to make money on speeding tickets.
UK roads really frustrate me, more traffic lights being put in. I live in Cambridge where we keep adding them to roundabouts, taken away almost every single give way junction and replaced with a light, changed all the speeds on main roads to 20Mph and adding bicycle green lights to our traffic lights. As a regular biker and driver the experience for both forms of transport suck.
Don't get me started on roadworks here in UK