This Walk Score Gmap plots out bus/rail stop arrival times on an SF grid, and also displays how far you can expect mass transit to take you (in any direction) via color-coded blobs representing 15, 30, and 45 minutes of travel. Change your departure time and the blobs'll expand and contract accordingly, unless your start point's Daly City, which is tough to leave -- but hey! You're in Daly City! Why would you want to?

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The handy map's at WalkScore.com