Study shows bicyclists lower risk
Pantagraph.com: Study shows bicyclists lower risk
Researchers think while changes in road infrastructure to accommodate cyclists might calm traffic, the mere presence of bicyclists in large numbers causes vehicles to reduce speeds.
As cyclists rise in number, a threshold may be reached that compels cars to drive more slowly.
The study by the University of Colorado looked at crash data from 24 California cities for an 11-year period ending in 2007.