My preferred meal on the road is a fajita bowl from Chipotle. Skip the rice and beans, get double peppers & onions, triple steak, guacamole, pico de gallo, and maybe one of the hotter salsas. It totals about $13, but it's quick and pretty good quality material.
This map shows there's a horde of chipotle stores littered about the bay area. http://www.chipotle.com/restaurants/...&state=ca&zip=