[pclmulqdq]

Nobody goes 70 mph on freeways. They go 80 mph on that road because it's the speed of traffic. If you declared a "speed limit reset" and raised the speed limit to 80 mph, people won't be going 90 mph. They will be going the speed limit.

[iso1631]

In the UK 80-90 was quite normal 25 years ago, and off peak you'd find the outside lane of the M40 doing over 90 a fair amount

It's not today as there's far more traffic. It's rare to have the opportunity outside of a few areas (south of Bristol on the M5, north of Kendal on the M6 etc). When I first learned to drive I'd do M62 to M5 in well under an hour, today it's about 20 minutes longer.

[saalweachter]

So "the actual safe limits of modern cars" just means "the speed everyone is currently driving"?