Well there's a relief
At least it can be temporarily overridden. I've been in about three accidents over the course 4 decades of driving and none were due to excess speed. I've dodge a good many potential accidents by hitting the accelerator instead of the brake though. More importantly, it is far less likely to result in a bashed in rear bumper when the person behind you misses your brake lights.
On the lighter side, this would put a whole new - ah - skid(?) on high speed car chases.