SAN DIEGO -- Surveillance cameras aimed at increasing traffic safety by capturing images of vehicles driven by red-light runners -- leaving them facing costly citations -- went into operation Thursday at three more San Diego intersections.

The newly installed photo-enforcement equipment will monitor stoplight compliance at Balboa Avenue and Kearny Villa Road in Kearny Mesa; Genesee Avenue and North Torrey Pines Road in the Torrey Pines area; and Nimitz Boulevard and Rosecrans Street in the Roseville/Fleetridge neighborhood, according to police.

The cameras, which are now trained on 15 road crossings in the city, take photos of the front and back of offenders' autos and shoot 12-second video snippets of them, SDPD spokeswoman Monica Munoz said.

The devices are triggered by roadway sensors that activate when a traffic light turns red.

"A motorist who is caught in the intersection while the signal light is yellow will not be photographed," Munoz said.

A stoplight-running violation carries a minimum fine of $436. For the next 30 days, however, offenders busted at the newly equipped road crossing will receive penalty-free warning notices, she said.

The other intersections monitored by the cameras are:

A Street at 10th Avenue in the Core-Columbia district

Aero Drive at Murphy Canyon Road in Serra Mesa

Camino del Rio North at Mission Center Road in Mission Valley

Camino del Rio North at Qualcomm Way in Mission Valley

Clairemont Mesa Boulevard at Convoy Street in Kearny Mesa

Cleveland Avenue at Washington Street in University Heights

El Camino Real at Del Mar Heights Road in the North City area

Garnet Avenue at Mission Bay Drive in Pacific Beach

Grape Street at North Harbor Drive in the Harborview area

Mira Mesa Boulevard at Scranton Road in Sorrento Valley

Mira Mesa Boulevard and Westview Parkway in Mira Mesa

10th Avenue at F Street in the downtown East Village district