Because of financial limitations and ongoing technical problems, though, Philadelphia’s 23-year effort to create a central traffic-control system has seen slow progress. It takes more than simply networking the city’s lights. The old traffic signals are incompatible with a modern control system, and the signals themselves need to be replaced. Only a third of the city’s signalized intersections have lights new enough to be networked through the Traffic Operations Center Streets Department’s offices on G Street in the Feltonville neighborhood, and of those, just 650 can be managed remotely. About 350 intersections are technically linked to the operations center but can’t be controlled remotely because of hardware problems.