A GRAPHIC METHOD OF ESTIMATING FLOW IN A NETWORK

A SET OF MATHEMATICAL EQUATIONS, BASED ON THE ASSUMPTION THAT TRIPS WERE DISTRIBUTED TO DESTINATIONS EQUALLY FROM AN ORIGIN ZONE AND THAT HIGHWAY NETWORKS CONSIST OF THREE DISTINCT SYSTEMS--LOCAL, ARTERIAL, AND EXPRESSWAY, WERE FORMULATED FOR PREDICTING AVERAGE DAILY TRAFFIC FLOW IN A HIGHWAY NETWORK. A MEASURE OF EXPRESSWAY, ARTERIAL, AND LOCAL STREET SPACING, AN ESTIMATION OF THE NUMBER OF TRIP ORIGINS PER SQUARE MILE, AND THE AVERAGE TRIP LENGTH, MUST ALSO BE COMPUTED TO OBTAIN THE TRAFFIC VOLUME BY WHICH TRAFFIC FLOW IS MEASURED. NOMOGRAPHS WERE USED TO SOLVE THE EQUATIONS AND THEY PRODUCED ANSWERS WITHIN PLUS OR MINUS TEN PERCENT WITH AN AVERAGE ERROR OF TWO PERCENT. THESE COMPUTATIONAL GRAPHS CAN BE USED FOR ALL THREE SYSTEMS IN THE HIGHWAY NETWORK. REFERENCES' A DIRECT APPROACH TO TRAFFIC ASSIGNMENT, M. SCHNEIDER, HIGHWAY RESEARCH RECORD, NO 6, 1963.

• Supplemental Notes:
  • Research NeWS, VOL 6, NO 4, PP 2-6, 2 FIG
• Corporate Authors:

  Chicago Area Transportation Study

  300 West Adams Street
  Chicago, IL  United States  60606
• Authors:
  • Campbell, E W
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Arterial highways; Average daily traffic; Expressways; Forecasting; Length; Mathematical analysis; Networks; Nomographs; Origin and destination; Roads; Spacing; Streets; Traffic assignment; Traffic flow; Traffic volume; Travel
• Uncontrolled Terms: Trip
• Old TRIS Terms: Local street; Origin; Roadnet
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00227047
• Record Type: Publication
• Source Agency: Urban Transp Plng Abstracts /Prelim
• Files: TRIS
• Created Date: Aug 13 2004 6:47PM