But that's not necessarily Congress' job.
Nice work, guys. Time for another seven week recess.
No, it's the states which normally create their own traffic laws. Federal agencies regulate the technology used in cars (think airbags, seatbelts, that kind of thing), which is obviously relevant in the case of self-driving cars. But at the moment they're reluctant to pass judgment on technology that's still so new. They'd prefer a little more research be done to find out what the "safest" type of autonomous car is before they make any regulations.
"Just please no Skynet, that's it for now."
In short, self-driving cars present a really confusing overlap between traffic regulation and car technology regulation; even if the Federal government does lay down some national guidelines, you can imagine how some states -- say ones with automakers, or tech companies, or more public transportation infrastructure -- might have a different opinion on this than other states. They're not all going to be happy with a national solution, which means self-driving car regulation is going to hit a political crash test wall pretty fast. Want to see your elected representatives forcefully arguing about "ghost-riding the whip" on C-SPAN? Because it's coming ...