In the US, there aren't many, if any, speed cameras. At least I've not seen any.

What we do have an abundance of are "red light cameras". It always seems that they're in places where people tend to push yellow lights, as opposed to places where accidents tend to happen. Also, they're often installed under a system where they're run by private organizations who provide the data to the local government, and then get kickbacks from the government based on the number of fines they collect. There's not a conflict of interest there at all. Nope.

There were some here in la county, california. Not any more, tho.

We have something here call the "california hesitation", where no one goes for about five seconds after the light turns green, to give all the folks running the red a chance to go.

After my IAM training I spent a while self calibrating my speedo from GPS and found with my standard tyres at the recommended pressure an indicated 33mph was 30, but an indicated 68mph was 60! Gives a better realisation of exactly what speed you were doing, if for some reason you had to discuss this fact with a uniformed officer...ahem

Actually met one of my closest police friends in this sort of situation. I was roundabout playing and he spotted me, but after discussion he realised I was exactly on the speed limit and although drifting trough each roundabout, I was staying in my lane and obviously in control. Turns out he was an IAM examiner and went to some of the same track days and a general good guy.

Heh. I learned the california hesitation pretty quick. I vaguely recall hearing my driver's ed instructor (back in Canada), mention that you should always double check that the cross traffic is actually stopping, but the why of it is so much more obvious here. What really irks me isn't the folks running the red, but the idiots who think that they're entitled to squeeze four cars through a left turn after the light turns red, even if they hadn't entered the intersection yet (of course, I think this is partly due to the pathetic lack of advance turn signals on traffic lights).

5mm of wear on your tire reduces your speed from 60mph to just barely over 59mph (at least with my 235/45-17 sample set). Just for reference.

Sheesh, how bored ARE you?

Also, I just checked. My speedo matches my GPS receiver within about 1MPH at 75MPH.

I was just giving you a hard time anyway. It IS interesting, just the last thing I would think to do.