Actual DRIVING TESTS should be mandatory for everyone, every 5 years. Yeah it would cost, but if adhered to, it would make the roads so much safer.
I commute 54 miles each way, just SW of Boston. After 10 years of it, I'm still amazed each week by some of the drivers I encounter out there. From those who feel they are indestructible, to those who are obviously paralyzed with fear behind the wheel, I see it all.
Possession of a driver's license was once a privilege, but is now looked at as more of a "right". Someone who is incapable of properly controlling a multi-ton vehicle at speed, should NOT have the right to be out behind the wheel. I don't care if they are 16 or 106, everyone should be tested periodically, in real world situations.
Lastly, law enforcement needs to be out there trolling for these drivers. The crazy drivers, the paralyzed with fear drivers, all need to be dealt with.