simpler solutions exist (trains, mass transit, work from home)? It seems that the only solutions that are allowed are ones that make private businesses extraordinarily wealthy. I think we need to fix THAT problem before we need to 'invest' in bigger, better technology.

Would stop some of the long waits. I always thought their should be a law for that and if you don't let the car next to you go first a million dollar fine. Most reasons for traffic is selfish drivers. Not all but most. We can forget public transportation in any major way. Americans don't want it. I have heard it forever. The cities have increased riderships but the suburbs? Not so much. I do want it, but it is not realistic in our lifetime.

At that price point, I'll also take the train.

I personally feel uncomfortable with computer controlled speed, brakes or steering in cars. I can still do it myself, thank you.

If you say their time costs an average $20/hour (a bit lower than the national figure), that's $110 billion, plus 2.9 billion gallons at $3.80 would get you $121 billion.

Having watched their simulation, I think I'd have to be blindfolded and sedated before I allowed a computer to take me across a junction at those speeds with those gaps.

It's called a railway train.