My UK 2017 Ford has technology that achieves this functionality, albeit not switched on by default and therefore also not unable to be deactivated by the user. It's fine, I guess?
The car has a camera that records speed limit signs as it passes, and shows the last speed it saw on the dashboard. I'm not sure if it's the camera or the built-in maps that allow it to distinguish between single carriageway and dual carriageway roads, which have different limits for the same signage, but it's pretty good at it. It does have GPS, but it doesn't seem to use it for limits in general driving -- that probably means it's insufficient for this law.
One may set visible or audible announcements, or even update the cruise control limited, based on the current detected limit. The downside of using a camera, though, is that as good as it is at picking up the right limits (and it is good!) it struggles with advance warning signs and also with some junctions on corners where the limit changes if you turn off.
On the other hand, if the audible reminder sounds when your speed goes above the limit then the obvious thing to do is to hit 85mph then not slow down and it won't bother you again :).
The car has a camera that records speed limit signs as it passes, and shows the last speed it saw on the dashboard. I'm not sure if it's the camera or the built-in maps that allow it to distinguish between single carriageway and dual carriageway roads, which have different limits for the same signage, but it's pretty good at it. It does have GPS, but it doesn't seem to use it for limits in general driving -- that probably means it's insufficient for this law.
One may set visible or audible announcements, or even update the cruise control limited, based on the current detected limit. The downside of using a camera, though, is that as good as it is at picking up the right limits (and it is good!) it struggles with advance warning signs and also with some junctions on corners where the limit changes if you turn off.
On the other hand, if the audible reminder sounds when your speed goes above the limit then the obvious thing to do is to hit 85mph then not slow down and it won't bother you again :).