It’s not. Marin doesn’t get BART or Caltrain. There’s a once-an-hour bus service that gets stuck in traffic. In fact it gets stuck in worse traffic than the cars because it takes a highly congested off-ramp (which shares car flow with an on ramp) to crawl to the Tewksbury Ave & Castro St stop. Then has to take the same on ramp. Sometimes the delay is so much you can not only miss your transfer, but the transfer an hour after that.