CATS METHOD OF TRIP DISTRIBUTION

THE OPPORTUNITY MODEL, DEVELOPED BY MORTON SCHNEIDER AND USED BY CATS FOR TRIP DISTRIBUTION, ASSUMES THAT' TRIPS REMAIN AS SHORT AS POSSIBLE AND THAT EACH DESTINATION HAS A STATED PROBABILITY OF BEING ACCEPTED AS A TRIP END IF IT IS CONSIDERED. TRAFFIC SIMULATION, THE REPRODUCTION OF TRAFFIC FLOW IN A NETWORK, CAN BE ACCOMPLISHED IF THE PROPER NUMBER OF TRIPS ARE SENT THROUGH THE NETWORK IN THE PROPER DIRECTION AND IF THEY STOP AFTER HAVING TRAVELED THE PROPER DISTANCE. THE NETWORK AND THE TRIP END ESTIMATES, BOTH IN NUMBER AND GEOGRAPHIC LOCATION, DETERMINE HOW MANY AND WHERE THE TRIPS WILL BE SENT. THE PROBABILITY FACTOR DETERMINES HOW LONG OR HOW SHORT THE TRIPS WILL BE. TO ACCOUNT FOR A POSSIBLE DIFFERENCE IN TRIP LENGTH, ALL THE TRIPS WERE GROUPED INTO SHORT, LONG RESIDENTIAL, AND LONG NON- RESIDENTIAL. NEITHER TRAVEL TIME NOR DISTANCE ARE CONSIDERED EXPLICITLY IN THIS DISTRIBUTION FORMULA. ONE OF THE MOST DIFFICULT TASKS IS THE CALIBRATION OF THE PROBABILITY VALUES. INITALLY, THIS CALBRATION WAS PERFORMED BY TRIAL AND ERROR DEDUCING THE TOTAL VEHICLE MILES TRAVELED FOR A SYSTEM FROM THE DESIRABLE TRIP LENGTHS AND THE NUMBER OF TRIPS. A FORMULA IS PRESENTED WHICH ALLOWS CALIBRATION OF THE PROBABILITY FACTOR FOR AN AREA WITH A PARTICULAR TRIP LENGTH AND DENSITY, PROVIDED THAT THE PROBABILITY FACTOR IS KNOWN FOR ANOTHER SET OF TRIPS WITH A PARTICULAR AVERAGE TRIP LENGTH & DENSITY.

  • Supplemental Notes:
    • Research NeWS, VOL6, NO1, PP2-11, 1FIG, 3TAB
  • Corporate Authors:

    Chicago Area Transportation Study

    300 West Adams Street
    Chicago, IL  USA  60606
  • Authors:
    • Campbell, E W
  • Publication Date: 1964-2-14

Subject/Index Terms

Filing Info

  • Accession Number: 00240882
  • Record Type: Publication
  • Source Agency: Urban Transp Plng Abstracts /Prelim
  • Files: TRIS
  • Created Date: Dec 22 1994 12:00AM