Our in-town buses can carry two bikes on a front rack. The county wide buses can hold three bikes on a front rack. The big buses going to San Francisco have either two-bike racks or one luggage compartment for bikes. With strict limits some of the long-distance buses will let bikes in back. During off-peak hours the rapid transit trains will let a few bikes, with the proper permit, ride in the back car or so I am told.
How about in your area?