SEATTLE -- Following a one-year pilot program, Mayor Greg Nickels announced Wednesday the city will install an additional 24 red light cameras at 19 intersections during 2008, bringing the total to 30 red light cameras in use at 22 intersections citywide.

New & Existing Camera Locations North Seattle •EB Northwest Market @ 15th Northwest • EB 45th @ Roosevelt •WB Northwest Market @ 15th Northwest •SB 15th Northwest @ Northwest 80th •SB Stone Way @ Northwest 40th •NB Aurora @ Northwest 85th •EB Northeast 80th @ Fifth Northeast •EB Northeast 45th @ Union Bay Pl. •WB Northeast 45th @ Union Bay Pl. •NB Northeast 45th @ Union Bay Pl. Central Seattle SB Sixth @ James • EB 5th @ Spring •SB Fifth @ Spring • EB Denny @ Fairview •SB First @ Marion • WB Denny @ Fairview •NB Broadway @ Olive •EB Olive @ Broadway •SB Broadway @ Pine •SB Boren @ James •SB 23rd @ E John •NB Ninth @ James South Seattle •NB 14th South @ Cloverdale • NB Rainier @ South Orcas •EB Cloverdale @ 14th South • SB Rainier @ South Orcas •WB Avalon @ 35th Southwest •SB 35th Southwest @ Southwest Thistle •NB Rainier @ South Massachusetts •WB South McClellan @ Martin Luther King KEY • = EXISTING CAMERA • = NEW CAMERA NB = Northbound SB = Southbound EB = Eastbound WB = Westbound

"There is no excuse for running a red light," Nickels said. "An instant of recklessness or neglect can take a life or cause serious injury. Expanding this successful program will make our streets safer for pedestrians, cyclists and drivers."

The Seattle Police Department and the city's Department of Transportation selected the 19 intersections based on traffic safety.

A report released Wednesday found that the frequency of red light running generally dropped by 50 percent at the intersections where cameras were installed. The number of injury accidents and the number of people injured also declined.

Six camera systems operated at four intersections in the pilot project:

Eastbound and westbound approaches at Denny Way and Fairview Avenue North

Northbound and southbound approaches at Rainier Avenue South and South Orcas Street

Eastbound approach at Fifth Avenue and Spring Street

Eastbound approach at Roosevelt Way and Northeast 45th Street

The program issued 16,539 citations during the pilot, resulting in about $1.1 million in monetary penalties.

Using sensors at the intersections, digital cameras photograph the license plates of cars running a red light. A Seattle police officer reviews each violation and, if approved, a $124 citation is mailed to the vehicle's registered owner.