Although Mr. Peduto risks unpopularity, his motivation to cut traffic accidents and injuries deserves respect. The idea came from discussions he had with a Carnegie Mellon University professor about the death of a student who was struck by a vehicle while crossing Forbes Avenue in April.

Other cities including Philadelphia, Washington, D.C., and some in other countries have installed such cameras. A Philadelphia official told the Post-Gazette that the system had proved very successful, decreasing the number of violations at intersections by as much as 80 percent.

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