The Boston Big Dig was a great improvement -- buried the highway and revitalized downtown and Seaport.<p>Maybe Austin should do something similar. It can narrow the streets and build some underground highways. Leave the above-ground for pedestrians and bicycles, traffic that can actually stop if it spots something interesting. Cars mostly go from here to there, never stopping in-between.<p>Buses are much cheaper than trains and can be re-routed if it turns out the population centers shift.