Two traffic signal cameras officially went into operation today at City Hall and owners of cars that run red lights can expect to get a $100 fine in the mail.

The cameras are located on the south and north sides of City Hall and have been operating for two months in preparation for their official use. During the first month, about 2,900 warnings were issued to drivers.

"I believe that over time the red-light cameras will change the behavior of motorists who disregard traffic signals while driving around City Hall," said Vince Fenerty, executive director of the Philadelphia Parking Authority, which oversees red-light cameras in the city.

New cameras will be installed at four more intersections next year, including at Henry Avenue and Walnut Lane, Rising Sun and Adams Avenues, Aramingo and Castor Avenues, and Aramingo Avenue and York Street.

   - Robert Moran