We recently moved to San Francisco and have been learning how the mass transit system works. We needed to get from our place to a restaurant in the city to meet friends, which entails using two systems, BART and Muni. But neither of their websites links in to the other, making planning a trip difficult.
Google Maps though, makes it simple. Enter the start and end address, it maps the route for driving. Then click the “Public Transit” link next to “Drive”, and it maps the entire route using BART and Muni.