This opens up a whole new world of pain for enforcement.
The technology relies on both gps and road sign recognition. Neither are infallible. (Some) Drivers will be tempted to rely on it entirely but, at times, it will be wrong - E.g. when you go past obscured road signs, overtake an hgv that has three different speed signs on the back, etc. It’s still down to the driver, but, if the system gets it wrong and won’t allow the driver to drive up towards the actual limit that will be equally as dangerous.
GPS is notorious for giving inaccurate location data in built up areas because of reflections of the signals from buildings. It can be out by 100m or more at times. And, it takes time to recover, eg when coming out of a multi-storey car park.
Some foil over the gps and tape over cameras will render the controls inoperable. Just because a car is fitted, where is the mandate to ensure it’s used? It’s still down to the driver to obey the speed limit.
And, who is going to test it’s operation? Going to make the MoT an interest time.
Ill thought out.
There are numerous reasons behind road deaths. Yes, often speed is a factor. But also, differential speed between vehicles causes many accidents. Speed and weight is a big killer to.
There is an argument for imposing a gradual restriction above the limit with a ceiling of maybe 20%. A hard limit will be dangerous at times.