This is true,
although any crash that does happen would be much worse. And fuel economy would be terrible.
The 55mph speed limits in the US were introduced during the fuel crisis, because that was the most economical speed to drive at.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 13:19, archived)

That's the main reason the limits won't be increased (the fuel, not the crashes)
Crashes would be much worse, but apart from ones in trafic jams I'd assume that most accidents on motorways occur at higher speeds than 70mp/h already
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 16 Jun 2009, 13:21, archived)

they probably do,
but if the limit was 90, people would drive at 110.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 13:22, archived)

I don't think so.
People drive at over 70 miles an hour because they feel safe doing so. I'm not sure how many people's cars would feel safe when in excess of 100 miles an hour so I don't think many people would do it.
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 16 Jun 2009, 13:24, archived)

People drive at over 70 because they're impatient.
Besides, plenty of people have cars that can cope with going over 100 these days, all the fancy BMWs and stuff that's on the road these days. Maybe not your family hatchbacks, but having two classes of cars that go at different speeds would introduce dangers of its own. And we've already got the lorries and coaches that can't really go much faster.
( Moon Girl Technologies horrendous beanbag, Tue 16 Jun 2009, 13:28, archived)

I already do.

( baldmonkey a frothy foul-smelling vaginal discharge, Tue 16 Jun 2009, 13:39, archived)