I think it fundamentally shifts the cost of transport from marginal to capitalized. Meaning a 20 minute trip is $0.50 of gas and some fraction of the manufacturing cost of the car. Today it's that plus $5-10 to the driver.

It's somewhat equivalent to the advent of trains but on a personal level. In the way that trains made shipping goods across the country more or less free once the rail was built that's what's going to happen to people and packages getting around cities.