[AstralStorm]

Things are being done, but the most effective one would be to reduce speeds and number of cars.

Since USA is big distances, 1 has strong opposition, and 2 even stronger.

They could also make the drivers license short time, like 2 years requiring a refresh exam, but that'd be a real pain in the rear.

You could mandate built in breathalyzers, but they would routinly be failing or bypassed... Though it's a good attempt.

Ultimately getting rid of reducing number of unsafe human drivers would be good.

[JoeAltmaier]

Bypassed? Unlikely. Breathalyzers are all about tamper-detection. If you know of a way of bypassing one, contact a lawyer. Somebody will pay you boatloads of money as an expert witness.