I presume that the system would simply indicate the proportion of times that a vehicle is seen driving and performing a dodgy manoeuvre. If I'm seen on the roads 1,000 times and seen performing a dodgy lane change once (and I would like to apologise to the Mondeo driver on the A21 yesterday), that's the fact that should be recorded.

The thing is that there's not a 1:1 relationship between a "risky" maneuver and causing an accident. An example could be an F1 driver who takes curves at 20mph over the recommended speed in a sports car. Compare this mentally to a Prius driver who drives under the speed limit in the left lane. The Prius driver is "being safe" but causing a long line of tailgaters and people passing unsafely on the right, as well as agitating people and causing them to drive more aggressively. I doubt that the first few iterations of this system will take psychological effects on other drivers into account (if they ever consider that / have a profit motive to do so at all).

Indeed, a proportion tells us something about the probability of making a driving mistake. A boolean tells us little in comparison.

There is definitely a gradient of severity with "reckless" driving.

Have you ever driven full speed through a red light? Sat at a complete stop of a freeway in an attempt to merge in to traffic? Taken a U-turn on a freeway? There are things that don't cause an accident, but once a driver does, they should probably not be allowed behind the wheel for at least a year, some things possibly even a lifetime ban or some additional evaluation.

There is an interesting dichotomy because smart phone usage has really caused a big problem with distracted driving. Even Geico experienced an increase in claims last year, and I suspect this was why. When I watch traffic sometimes over 50% of drivers are looking at a phone screen rather than the road. At the same time, mobile sensors are enabling something which will end with roads being extremely safe and killing very small numbers of humans a year.

There is a lot of talk about privacy and freedom on the internet. Privacy and freedom on the road is dead in all dimensions. You won't be anonymous, you won't be able to take go somewhere when the police/authorities are looking for you, there may not even be private ownership of any vehicles in the US in 10-15 years.

I will go even that almost 100% will be tagged soon or later.

What we should be interested in is the top one percent.

So something like http://comroads.com ?