This answer gets more awesome the more I think about it.
Initially, I was going to reply that it was crass. Then, I thought about it and grinned.
But I think that flakmonkey's point is that yes, if you're poor, you'll be stuck in traffic at least just as long. More likely though, you'll be stuck in traffic far more than currently, because people who can afford to pay for it will. Being that freeways use public funds, that probably shouldn't be the case.
Time redistribution. People with more time will be required to pull over to the side of the road and wait for some time interval to redistribute their share of excess time to people in a hurry. It's part of the self driving car program and will be administered by the Federal Dept of Transportation. It's only fair.