I got fined last year doing 67 in a 60 zone only about 6 feet from an 80 sign that was coming up.
I'm sure it's blatant revenue raising. All they sent was a bill. I've only been fined once before and that was in the UK (yet again 67 in a 60 zone). At least they sent a leaflet on road safety and offered me a driver safety lecture if I didn't want to lose any points.