Hey I've spent plenty of time in LA (Santa Monica actually). You know why, I think, most people dont take public transit in LA? Its not cool enough! DC/LA have the two worst traffic problems in the country, DC has a bustling public transit system, LAs is shunned by a lot of people. IMHO, its because in LA its just not cool to take the bus to work. People want to drive their cars everywhere, yet the LA Metro runs from where, I think Long/Redondo beaches to Pasedena out to Hollywood?
Look, cant blame them. Its 70 and sunny every day there. I'd want my car too. But just because people dont use the Metro doesnt mean its not an option. I take the train @ 40 minutes each way every day, driving would be about the same. Tell most people that who arent used to taking public transit and most would opt to stay in their cars.