
If you've never checked out the link list in the sidebar of this blog, please stop what you're doing and visit
SF Cityscape. In addition to some cool photos, they have some remarkable and beautifully drawn fantasy maps of Bay Area transit.
The latest addition is called "San Francisco Main Lines"
(PDF | GIF). The map shows all of SF's rail lines (BART, Muni, Caltrain) in addition to every Muni bus line that runs with headways of 10 minutes or less on weekdays. The idea being that if you know the bus is going to arrive at your stop less than 10 minutes after you do, most people don't feel the need to check schedules.
These bus lines are the workhorses of Muni's fleet; ridership on these lines constitutes a majority of Muni's ~700,000 daily trips. Many of the lines shown in this map suffer from chronic overcrowding and delays (I'm looking at you, 14-Mission!) and poor performance on these lines has a disproportionate effect on riders' opinions of Muni overall.