Being from LA, we're used to driving around ourselves. I loved being able to use a Taxi and not having to deal with the stress of traffic. And I love the fact that they have zones, so no matter where you travel there will always be a fixed price and you don't have to worry about the meter running and the cab drive intentionally taking the long way. And don't forget to tip the driver, a dollar or two ought to be enough.
If you're planning a trip to Washington, DC or already live there then you should definitely check out this interactive map.
Move your cursor over any road and click to get current information about the traffic conditions on it. In some places you can get live traffic photos and even video!
Listen to WTOP-1500 AM or 107.7 FM to get traffic reports from around the Washington, D.C.-region every 10 minutes, on the 8's, as they say. They do this 24 hours a day, and even offer updates on whether trains or subways are delayed. Useful if you have to drive or commute around the city. Also, if you go in the subway, message boards alert you to when trains are coming and if there are delays in the system. May not always be up to date, however.
Although it is an old American city, I wouldn't think of getting around without a car. Especially in winter.