What a lop-sided unfounded comment. Come to Saint Louis and look at all of the half filled trains and empty buses running around the metro area. They go where you don't want to go or they don't come where you live. So you need a car to get around here. They are only useful for the sporting events if you happen to live near one of the lines. I can drive to my work in 25 minutes (about 25 miles) on the best of days. If I had to take a bus, it would take well over an hour, probably closer to 90 minutes. And I would still have to walk to get to my final destination.
Some cities and neighborhoolds are great for public transit, rest are not. Just visited son in Cleveland who lives a few blocks from their RTA and daughter in DC who lives a 15 min walk from their Metro. Convenient if you visit commonly visited places; otherwise not.
of course there are many factor not the least of which is this.
"The economy, rather than any longer-term secular trend, has impacted driving and licensing among younger people, said Paul Taylor, chief economist with the National Automobile Dealers Association. Unemployment has led some younger consumers to drive less, and the cost of insuring a 16-to-19-year-old driver alone can discourage cash-strapped parents from allowing them to get licenses. State licensing requirements and restrictions by many high schools and colleges on driving are also a factor."