Galen's advice looks good. I would add that there are usually alternate routes that are better for cycling than the jam packed arterials. Your local bike group most likely publishes a map with good bike routes. But you'll find your own routes using maps and bicycle exploration trips. After a few years of riding, I literally know hundreds of routes across my city that are faster, more scenic and less stressful than the major streets that cagers usually use.
Good luck and enjoy your bike!