City of PhiladelphiaView metadata for key information about this dataset. Preventative maintenance is necessary for traffic signals and is performed while the equipment is still working, so that it does not break down unexpectedly. This layer was developed to aid the Traffic Division in planning, organizing, and maintaining traffic flow within the City of Philadelphia. Examples include: the maintenance and placing of stop signs and signals and monitoring street travel direction. This polygon layer also has an accompanying arc layer . For questions about this dataset, contact dominick.cassise@phila.gov . For technical assistance, email maps@phila.gov .ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/11c2040839a945cf8e3baaa7db35029f_0engPHLmapsPublicTraf PM Dist [Pennsylvania--Philadelphia]Web servicesPennsylvania--PhiladelphiaPennsylvaniaLast Modified: 2009-03-09