AN ANALYTIC AND EXPERIMENTAL EVALUATION OF ALTERNATIVE METHODS FOR AUTOMATIC VEHICLE MONITORING

THE PURPOSE OF THIS REPORT IS TO DETERMINE THE FEASIBILITY AND THE RELATIVE MERITS OF ALTERNATIVE METHODS OF AUTOMATIC VEHICLE MONITORING. THREE BASIC APPROACHES TO THE AVM ARE: (1) PROXIMITY SENSING (PAVM) WHICH LOCATES VEHICLES BY THEIR PROXIMITY TO FIXED POSTS, (2) ELECTRONIC TRIANGULATION OR TRILATERATION (TAVM), WHICH LOCATES VEHICLES BY ELECTRONIC RANGING FROM A FEW FIXED STATIONS, AND (3) (DAVM), WHICH CONTINUOUSLY LOCATES VEHICLES BY MEANS OF ON-BOARD COMPUTATION OR EQUIPMENT. IN THIS STUDY TWO POINTS ARE EMPHASIZED: AN ANALYSIS OF AVM APPLICATIONS WHICH WOULD ENHANCE CONVENTIONAL BUS OPERATIONS, AND A THEORETICAL AND EXPERIMENTAL ANALYSIS OF THE TAVM CONCEPT. THE MAJOR ADVANTAGES OF A DAVM SYSTEM ARE SPEED AND FLEXIBILITY. SINCE MULTIPATH PROBLEMS ARE OF LITTLE CONCERN IN THIS SYSTEM, IT IS POSSIBLE TO LOCATE VEHICLES ANYWHERE IN THE URBAN AREA WITHOUT REQUIRING ANY WAYSIDE RECEIVERS OR TRANSMITTERS. THE TAVM, ALTHOUGH POTENTIALLY MORE EFFECTIVE THAN THE PAVM, IS A SUFFICIENTLY INNOVATIVE CONCEPT THAT WOULD REQUIRE APPROXIMATELY $1,000,000 TO DEVELOP A WORKING SYSTEM SUITABLE FOR MONITORING TRANSIT VEHICLES. THE AUTHORS CONCLUDED THAT THE TAVM AND DAVM ARE MUCH MORE EFFECTIVE SYSTEMS THAN THE PAVM FOR GENERAL AUTOMATIC VEHICLE MONITORING IN URBAN AREAS AND FOR REAL TIME COMMAND AND CONTROL OF BUS OPERATIONS. HOWEVER, BASED ON THE MANUFACTURERS' BIDS TO CTA AND CTA'S EMPHASIS ON USING THE AVM PRIMARILY AS A DEVICE FOR CHECKING SCHEDULE ADHERENCE AT DISCRETE POINTS WITH APPROXIMATELY 1.5 MILE INTERVALS, THE PAVM APPEARS MORE COST-EFFECTIVE THAN THE TAVM FOR THIS LIMITED APPLICATION. THE PURE PAVM ON THE OTHER HAND, CANNOT EFFECTIVELY LOCATE BUSES IN AN EMERGENCY, WHILE A TAVM CAN. THEREFORE, PRIMARILY BECAUSE OF LOWER COSTS AND SHORTER DEVELOPMENT TIME, CTA MIGHT PREFER THE PAVM SYSTEM FOR ITS SPECIALIZED NEEDS. THE FEDERAL GOVERNMENT, ON THE OTHER HAND, SHOULD PREFER TO SUPPORT THE DEVELOPMENT OF TAVMS OR DAVMS FOR BROADER PUBLIC INTEREST-ORIENTED USAGE. /UMTA/

  • Supplemental Notes:
    • PROJ NO ILL MTD 6
  • Corporate Authors:

    Institute Public Administration

    /Teknekron
    ,   United States 
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00242066
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Jan 3 1973 12:00AM