Journal ArticleDOI
The Los-Angeles Automated Traffic Surveillance and Control (ATSAC) System
TLDR
The Los Angeles Automated Traffic Surveillance and Control (ATSAC) System is described, emphasizing those features that provide a powerful and flexible capability to manage traffic.Abstract:
The Los Angeles Automated Traffic Surveillance and Control (ATSAC) System is described, emphasizing those features that provide a powerful and flexible capability to manage traffic. Many traffic detectors are used to collect data used for critical intersection control, traffic responsive control in networks, real-time surveillance of traffic conditions using color-graphic monitors, real-time evaluation of system performance, and automated generation of traffic signal timing plans. Closed-circuit television is used to provide additional information regarding the cause of congestion. Manual control of intersections from the control center is used to correct nonrecurring congestion. The hierarchical system architecture consists of a very fast supervisor computer networked with the control console, color-graphic monitors, and area computers that communicate with up to 400 intersections and 1600 detectors each. An evaluation of system performance concluded that stops were reduced by 35%, intersection delay by 20%, travel time by 13%, fuel consumption by 12.5%, and air emissions by 10%. The benefit/cost was 9.8:1, and the system paid for itself in less than one year. >read more
Citations
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Traffic Detector Handbook: Third Edition - Volume II
TL;DR: The objective of this Handbook is to provide a comprehensive resource for selecting, designing, installing, and maintaining traffic sensors for signalized intersections and freeways, intended for use by traffic engineers and technicians having responsibility for traffic sensors, whether in-roadway or over- roadway sensors.
Journal ArticleDOI
Traffic-responsive signal timing for system-wide traffic control
James C. Spall,Daniel C. Chin +1 more
TL;DR: This paper presents a fundamentally different approach for optimal signal timing that eliminates the need for extremely complex models of the traffic dynamics as a component of the control strategy.
Proceedings ArticleDOI
Traffic-responsive signal timing for system-wide traffic control
James C. Spall,Daniel C. Chin +1 more
TL;DR: The approach is based on a neural network serving as the basis for the control law, with the weight estimation occurring in closed-loop mode via the simultaneous perturbation stochastic approximation (SPSA) algorithm.
Book ChapterDOI
Utilizing Scenarios in the Software Development Process
TL;DR: This paper will describe scenarios in the context of an example and explain how computer-based tools can support the use of scenarios throughout the development process.
Journal ArticleDOI
Development of an emissions inventory model for mobile sources
A.W. Reynolds,Brian Broderick +1 more
TL;DR: In this paper, a methodology for estimating emissions from mobile sources using real-time data is described, which is used to calculate emissions of sulphur dioxide (SO2), oxides of nitrogen (NOx), carbon monoxide (CO), volatile organic compounds (VOC), particulate matter less than 10 μm aerodynamic diameter (PM10), 1,3-butadiene (C4H6) and benzene(C6H6), at a test junction in Dublin.