Re: Solution to many things
Your solution is a tad over-simplified Dextrous I fear.
For it to work the device would have to have online access to a vast database that tracked the speed limits of every road in the country. Limits that change. Roads that may have temporary road works etc.
So your device might limit the car to 50mph on a given road, but if it has temporary road works limited to 30mph then the device isn't going to stop you speeding
If such a device is going to shift the onus of responsibility from the driver to the device then it needs to be 100% accurate and I doubt that's possible,
If the driver still has to be totally aware of the limits and drive within them then what use is the device? It would lull people into a false sense of security, thinking that the device is always going to stop them from speeding and then one day they will be caught out.
Aside from that there's the complications of how such a device would integrate with every different manufacturer of vehicles and every different model. Anything that integrates with acceleration would be pretty serious.
What if it the device had a malfunction?
It couldn't make you speed up of course, but if it failed it could do the complete reverse, it might suddenly restrict your speed to 5mph or even zero.
Not good if you are just crossing a railway line or are in the fast lane of a motorway!
As for tracking vehicles, well tracking systems have been available for many years now. Unfortunately they are expensive and require constant subscriptions for the service provision so unlikely to catch on any more than the current take up imho.
Unfortunately our current authorities will continue to use the motorist as a cash cow and speeding fines and speed awareness courses are their prime revenue generator. So they're not going to allow anything to obstruct that revenue stream.
What would be interesting is if 100s of fed up people took to the motorways and drove 3 abreast, one in each lane at exactly 70mph.
If enough people did this then the motorways would rumble on at 70mph and they'd get no speeding tickets. I expect the police would quickly fond some excuse to prosecute them though.