I prefer a point to point system for speed cameras. Obviously in built up areas the distance between them would be shorter, but an average speed would be much fairer. Its all too easy to creep a couple k's over the limit, but most people would usually be on or below it. Cameras are often set in places where the k's do creep up a little, like for instance on the bottom of a hill.
If I hit the horsies for a few seconds to pass a tourist who is not paying attention to the world around him, get past him, and get back in the correct lane and come back to the speed limit again, I think its grossly unfair to be in the **** for it. Its the tourist that is likely to cause an accident, not me.
If you are consistently speeding, a point to point system will catch you, without penalising you for a few seconds of a few k's over.
I use cruise whenever possible, but even on a freeway, every rise and fall in the road will make a small difference to your speed. Cruise control doesn't apply brakes for you when you are effectively rolling down a hill.
It would be my contention that if I set my cruise control at the speed limit, I am acting within the supposed intent of the law, and those couple of extra k's that may occur occasionally are not killers, they are dollars.
I think the system has a lot of changes that need making. Road safety is important, sure, but the intent of speed limits is to limit ones speed to a reasonable and safe level. Charging someone with being 3km over the limit once in a 4hr journey is NOT (supposedly) the intent of speed laws, and makes NO difference to road safety. If that few seconds is the only time you exceeded the speed limit, with your foot off the accelerator rolling down an otherwise empty hill, then you have not in my opinion done anything worth being in the **** for.
Revenue raising, pure and simple.