00149224

Component

http://onlinepubs.trb.org...s/trr/1976/597/597-011.pdf

http://scholar.google.com...tvin&publication_year=1976

Computer-aided systems to coordinate traffic signals on urban roadways have been developed to achieve a smooth flow of traffic uninterrupted by the red phase of the signals. A new model, the traffic signal optimization model (TRASOM), has been developed that considers the three basic traffic variables: speed V, volume Q, and density, K. The model allows different road segments to have different Q-D-V relationships because traffic flow depends not only on the geometrics of the road but also on the environment and traffic conditions. Because the Q-K-V relationship defines roadway capacity as a function of speed, this relationship is an essential factor in the proper design of a progressive signal system. The objective of TRASOM is to search for the combination of control variables that results in the optimum set of dependent variables within the given constraints. The measures of performance in this decision making process may include percentage of throughput, progression speed, travel time, average and total delay, queue characteristics for left-turning traffic, or any combination of such variables. Compared to other computer-aided systems, TRASOM has simple data requirements, and output that is easy to interpret, and small implementation costs.

Publication of this paper sponsored by Committee on Traffic Control Devices. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01411453

FCP 42l1024

C-1-12

pp 44-45

1976

Transportation Research Record

0309025664

Digital/other

Information processing; Mathematical models; Optimization; Progressive traffic signal control; Traffic density; Traffic flow; Traffic signal control systems; Traffic speed; Traffic volume; Urban highways

Models

Highways; Operations and Traffic Management

TRIS, TRB

Mar 30 1977 12:00AM

• EVALUATION OF RAISED PAVEMENT MARKERS FOR REDUCING INCIDENCES OF WRONG-WAY DRIVING (ABRIDGMENT)
• GUIDELINES FOR APPLICATION OF SELECTED SIGNS AND MARKINGS ON LOW-VOLUME RURAL ROADS
• INDUCTIVE LOOP VEHICLE DETECTOR: INSTALLATION ACCEPTANCE CRITERIA AND MAINTENANCE TECHNIQUES (ABRIDGMENT)
• OPTIMAL CONTROL OF ISOLATED TRAFFIC SIGNALS (ABRIDGMENT)
• PLATOON DISPERSION CHARACTERISTICS ON ONE-WAY SIGNALIZED ARTERIALS (ABRIDGMENT)
• SOME RESULTS ON GUIDELINES FOR TREATMENT OF THE TRAFFIC CONGESTION ON STREET NETWORKS
• SPEED REDUCTION IN SCHOOL ZONES (ABRIDGMENT)
• STABILITY OF OCCUPANCY-BASED LIBRARY TRAFFIC CONTROL SYSTEMS
• TRAFFIC-RESPONSIVE RAMP CONTROL THROUGH THE USE OF A MICROCOMPUTER (ABRIDGMENT)
• TRUCK BLOCKAGE OF SIGNALS