Average speed measurements on gantries over motorways in UK seem to do an excellent job at reducing speed to the legal limit, because getting ticketed for going

Average speed measurements on gantries over motorways in UK seem to do an excellent job at reducing speed to the legal limit, because getting ticketed for going over is a £100 fine and 3 penalty points on your licence. Accrued points take 48 months to expire off your licence and it only takes two tickets (6 points) to lose your licence as a new driver. Experienced drivers are going to lose their licence when they hit 12 points. On top of the £100 fines, insurers all hike their rates for people with points. Cynics will say this is just revenue generation, but it seems to work, and £100 is cheaper than a lot of fines in US jurisdictions.