The number of infractions at the city's 49 camera-monitored intersections fell by almost two-thirds, from 38,000 to 14,000. The city began installing the cameras in 1999.

The cameras deter red-light running, Ramsey said, while sending a strong message about traffic enforcement in the District: "If you don't want a ticket, don't break the law. Don't speed and certainly, don't run red lights."