It's Simple Economics: Build Transit
"...But are the bleeding hearts the only ones who can justify the costs of public transit? Absolutely not, say researchers who analyze the comparative costs of public transportation and car commuting. Even the barest of financial comparisons, they say, show that each dollar spent on public transit gives back much more than a dollar invested in highways and other car-conducive infrastructure. Think of it this way: Public transit may be the hard-luck brother who hits you up for the occasional loan and embarrasses you at polite gatherings, but driving a car is like having a drug habit. Addicts never count the costs of their habit because that would be far too depressing."
Thanks to Transport Policy Listserv