Another comment on speed.
I rode a 97' GSX-R 750 from Minnesota to Tennessee to deal with a family emergency. The trip is right around 1000 miles. I never had a cruising speed of less than 85mph. I was doing generally between 85-95mph the entire trip. I went through two tanks in Illinois with my speed hovering around 115mph. I can honestly say I've never travelled that far on a motorcycle with so few incidents. I've made a run to town and almost been hit by numerous cars in less than a 30 mile round trip.
The point is that safety by going slower is an illusion. Your soft, pink, very fragile and lucky if you live through more than the tamest of auto wrecks.
With that being said there needs to be a class system for driver's liscences. Not in what you can drive, but how you can drive.
Class 3- No passengers, no interstate, daylight operation only, no inclimate weather
Class 2- Normal liscence like we all have.
Class 1- Conditions allowing: (traffic, weather, etc) unlimited speed limit on interstate/4+ lane highways not inside of city limits. 10mph over allowed on normal paved roads outside of city limits.
A class 3 would be great for kids. That is similar to the way a motorcycle permit works in Mn. Class 2, just do the same testing we do now. To get a class 1 liscence then some sort of more in depth testing would have to be done. Perhaps a road racing school. And to wean out some of the weak make it expensive, say $10k. I'd pay it. A vehicle would also have to be in good working order as well, and would need inspections annually. The infrastructure is already in place for that with DOT truck inspections. You wouldn't want someone honking down the interstate in a rusted out El Camino just because he thinks he's Mario Andretti.