Increase the speed limits? Then there will be idiots driving even faster.
No, studies have shown that people drive at a speed that feels reasonable, regardless of limit.
Raising a speed limit often means just making legal what everyone is already doing.
There will always be crazy people going faster but they were already ignoring the speed limit entirely to begin with.
Many drivers already drive too fast for the road condition, traffic situation and the limitations of both their car and their driving abilities.
What studies show that?
Instead raising the speed limit in various states has lowered accident rates.