TRAFFIC SIGNAL TIMING UTILIZING PROBABILITY CURVES
SELECTION OF THE PROPER CYCLE TIME BASED ON THE KNOWN TRAFFIC VOLUMES APPROACHING AN INTERSECTION CAN USE GRAPHICAL MEANS OF SOLUTION. SINCE THE DESIGN TRAFFIC VOLUME, WHEN DIVIDED BY THE NUMBER OF CYCLES PER HOUR, GIVES ONLY THE AVERAGE NUMBER OF VEHICLES PER CYCLE, IT IS NECESSARY TO INJECT A FACTOR WHICH WILL INCREASE THE RELIABILITY OF PERFORMANCE ABOVE 50 PERCENT. BY USE OF STATISTICAL DATA BASED ON POISSON'S SERIES ONE CAN PREDICT THE PROBABILITY THAT X OR MORE VEHICLES WILL ACCUMULATE WITHIN A GIVEN AVERAGE INTERVAL. A FIGURE IS PRESENTED WHICH GRAPHICALLY SHOWS THE RELATIONSHIP BETWEEN THE AVERAGE HOURLY TRAFFIC VOLUME, THE CYCLE LENGTH, AND THE REQUIRED GREEN TIME (IN SECONDS) DEPENDING UPON THE DESIRED RELIABILITY OR PROBABILITY LEVEL. TYPICAL PROBLEMS WHICH ARE SOLVED BY THE USE OF THIS FIGURE ARE PRESENTED. THE GRAPH PROVIDES AN EXCELLENT METHOD OF TIMING INDEPENDENT SIGNALS FOR TRAFFIC VOLUMES WHICH FLUCTUATE DURING THE DAY.
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Supplemental Notes:
- Vol 32, No 2, PP 48-49, 1 FIG
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Authors:
- Davidson, B M
- Publication Date: 1961-11
Media Info
Subject/Index Terms
- TRT Terms: Graphics; Intersections; Poisson ratio; Probability theory; Reliability; Statistical analysis; Traffic signal timing; Traffic volume
- Uncontrolled Terms: Graphical analysis
- Old TRIS Terms: Poissons ratio
- Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00225271
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 21 1994 12:00AM