There are now red light cameras at three more intersections.
The cameras are now up at Bustleton Avenue and Byberry Road, Woodhaven and Knights roads, and Academy Road and Grant Avenue.
There will be a warning period for 60 days with the new cameras. After that, violators will be fined $100.
Officials say the lights with the cameras have been tested to ensure that the yellow lights last for four seconds.
There are now cameras at 24 intersections in the city.