Eric FischerSan Francisco area traffic speed map
Black is less than 5 mph.
Red is 5 to 15 mph.
Yellow is 15 to 25 mph.
Green is 25 to 35 mph.
Blue is faster than 35 mph.
Data from Cabspotting.Here Be Dragons: Mapping Information and Imagination
October 21, 2011 January 14, 2012Intersection for the Arts
San Francisco, CA