Work is performed on Sunset Blvd. which requires closure of the eastbound right lane in stages from PCH to Kenter for a project which will streamline the traffic signals. According to the contractor, the work along the street is expected to be completed by March of 2012. This project includes trenching for cables and sensors, upgrade of signal technology, installation of cameras, and left turn arrows.
A number of residents have asked what this is all about.
The upgrade of the traffic signals on Sunset is part of the Automated Traffic Surveillance and Control (ATSAC) System, a state of the art technology that can reduce travel time by 12 percent, intersection delay by 32 percent and intersection stops by 30 percent. Los Angeles is a pioneer in the use of this traffic mitigation technology. At a conference at Duke, they showed what all traffic control centers of the next century will look like. LA is the model for ATSAC.
The installation of the ATSAC technology aims to create a steady flow of traffic at 35 mi/hr on Sunset through the Palisades
The City's ATSAC control center is four floors underground below City Hall East.
A number of residents have asked what this is all about.
The upgrade of the traffic signals on Sunset is part of the Automated Traffic Surveillance and Control (ATSAC) System, a state of the art technology that can reduce travel time by 12 percent, intersection delay by 32 percent and intersection stops by 30 percent. Los Angeles is a pioneer in the use of this traffic mitigation technology. At a conference at Duke, they showed what all traffic control centers of the next century will look like. LA is the model for ATSAC.
The installation of the ATSAC technology aims to create a steady flow of traffic at 35 mi/hr on Sunset through the Palisades
The City's ATSAC control center is four floors underground below City Hall East.
The speed/traffic sensors along the freeways and the freeway cameras are part of the ATSAC system.
ATSAC is a computer-based traffic signal control system that monitors traffic conditions and system performance, selects appropriate signal timing (control) strategies, and performs equipment diagnostics and alert functions. Sensors in the street detect the passage of vehicles, vehicle speed, and the level of congestion. This information is received on a second-by-second (real-time) basis and is analyzed on a minute-by-minute basis at the ATSAC Operations Center, to determine if better traffic flow can be achieved by changing the signal timing. If required, the signal timing is either automatically changed by the ATSAC computers or manually changed by the operator using communication lines that connect the ATSAC Center with each traffic signal. To supplement the information from electronic detectors, closed-circuit television (CCTV) surveillance equipment has been and continues to be installed at critical locations throughout the City.
The Department has installed CCTV cameras at 270 locations and new sites are being added. The major benefit of the ATSAC System is the ability to effectively manage dynamic traffic flow. Evaluation studies of the ATSAC System show that travel times, traffic signal delay, vehicular stops, air emissions and fuel use are significantly reduced.
The ATCS will automatically adjust traffic signal timing in response to current traffic demands by allowing ATCS to simultaneously control all three critical components of traffic signal timing, namely cycle length, phase split and offset.
The full report can be found at the LA City DOT site at: http://trafficinfo.lacity.org/html/atsac_1.html
~Haldis~
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