Regarding speed cameras. I was driving around the Netherlands and saw speed cameras for the first time (I'm from the US) in Apeldoorn. There were signs that warned drivers about them. In the US, in several rural areas have electronic signs at the edge of town, just outside of the limit change, which warn you when you are exceeding the limit through town. I would have no problem at all with permanent enforcement systems provided they were accompanied by advance warnings. If I am so inattentive to my driving that I miss the warnings and get a ticket, so be it. It is much safer (and should be much cheaper) than randomly placed patrol cars performing radar/laser speed enforcement.