DEPLOYMENT OF A HYBRID REGIONAL TRAFFIC SIGNAL AND CLOSED CIRCUIT TELEVISON COMMUNICATION SYSTEM: THE LOS ANGELES COUNTY EXPERIENCE

摘要

This paper will describe “lessons learned” by the County Los Angeles Department of PublicWorks (Public Works) to deploy a hybrid communications system comprised of fiber, twistedwire pair, leased telephone lines and wireless radios to support the communications requirementsfor real time monitoring of traffic signals and closed circuit television cameras (CCTV) installedover a large noncontiguous geographical area, containing many jurisdictions, with the ultimategoal of providing an integrated solution to coordinate traffic signals and enable real timemonitoring of traffic signals and CCTV cameras.Typical traffic signal system deployments are for a small, contiguous geographic area. Theuniqueness of the deployment of communications in Los Angeles County is that it covers anexpansive region and requires an infrastructure that supports communications for individualcities, Public Works’ maintained traffic signals (which includes both the unincorporated area aswell as individual cities), and agencies who have elected to have the Public Works host theirtraffic signal systems. In addition, communications must be provided/supported for PublicWorks’ Information Exchange Network (IEN), which provides a mechanism to monitor theoperation of traffic signals from different traffic signal systems and controller types acrossjurisdictional boundaries.This paper will focus on the numerous methods used by Public Works to deploy communicationsand that has included high speed licensed microwave and unlicensed broadband radios to provideboth localized control and long distance backhaul functionality. The paper will focus onmethods use, hurdles overcome, and lessons learned in the process.