Eric Fischer took publicly available data from the Muni ? San Francisco Municipal Transportation Agency ? showing the geographic coordinates of their vehicles to create this map showing average transit speeds over a 24-hour period. Muni is one of America?s oldest public transit agencies and today carries over 200 million customers per year in 80 routes throughout the city and county of San Francisco.
Black lines represent very slow movement under 7 mph. Red are less than 19 mph. Blue are less than 43 mph. Green lines depict faster speeds above 43 mph.
Eric Fischer is also the author of the remarkable Geotaggers' World Atlas.