BART serves Orinda, Lafayette, Walnut Creek, Pleasant Hill, Concord, and Pittsburg. BART stations have bus service as well. Paratransit for disabled riders in Contra Costa is quite good, but you must sign up for it with County Connection LINK and you must reserve your rides in advance.In general, rush hour/commute times in Contra Costa feature traffic jams on the freeways and crowded BART trains.
