30+k people die on the American roads every year.
Most accidents happen when one of more cars change lanes.
Why do they change lanes? To pass each other!
10 years ago I was in Italy (famous for its crazy drivers but having
30% smaller traffic deaths than the US) and I was stunned by the stress-free "autostrada" driving. There are just two lanes, both quite busy. The right lane has speed 90km/h (~55 mph), the left lane - 120 km/h (~75 mph). When there are 3 lanes, the speeds are, I think, 90/110/130. Speed limit is, I think, 90 km/h. No jerk tries to drive slowly in the left lane slower than "accepted". The impression is that slowing down traffic by driving in the "wrong lane" is punished by death.
How about we try the same thing?
Instead of going crazy about speed, make sure that people respect each other.
Punish severely driving in the wrong lane, defined as being passed on the right!