dynamic speed limits on roads
a dynamic speed limit for different cars in different areas according to driving skill and road conditions.
experienced drivers who have a high amount of skill when dealing with dangerous conditions on the road - or non-dangerous conditions, have the ability to drive faster than simply what the speed limit says. there are many drivers who drive above the speed limit, and never have a crash.
there are also unexperienced drivers, new drivers, drivers with little skill for handling dangerous situations, and drivers who's cars are simply too old or not well maintaned.
i propose the system to use technology in each car suitable to a particular driver's profile of driving skill and the car they are driving, taking into account road conditions. if the speed limit is broken according to the conditions set by the profile, they have broken the law and are effectively driving unsafely.
the system would involve a radio transmitter that would communicate with receivers at particular points along a road, with redundancy measures in place to see if the transmissions that are sent by the transmitter in each car have been modified.
for instance, an experienced driver who is sobre, has undertaken an advanced driving course and passed with a high score, and has a car that most of all the latest safety enhancements for preventing or softening the impact on themselves and other cars/people would have a speed limit of 100 km/h on a straight stretch of road, where as an unexperienced driver with an old car would have to drive 60 km/h on the same stretch of road.