By Rachel Gordon
San Francisco Chronicle

The number of injury collisions in San Francisco caused by red-light jumpers has dropped by more than half over the past decade, a dramatic decrease that officials attribute in part to cameras mounted at nearly two dozen treacherous intersections in the city.  In 1998 - the year after the first red-light cameras were mounted at a handful of intersections in San Francisco - the number of reported injury crashes involving red-light violations was 773. In 2006, the number was 374, according to data compiled by the city. Read more »