cell phone jammers should become standard equipment on all new cars.
cars should be single passenger only to prevent occupants becoming a distraction to the driver (not sure how kids would be transported around).
there should be only a bare minimum of instruments – speedometer and fuel gauge (less to confuse the driver).
radios would no longer be provided even as option (including aftermarket ones).
sensors on the steering wheel that could tell if the driver does not have both hands on the wheel at all times and automatically turn off the engine if the driver has his/her hand/hands off the wheel (though that might cause a problem on a busy high speed thoroughfare).
i will be forwarding these very good suggestions to my senator and representative for your safety and the safety of all americans.