ON THE FLOW CAPACITY OF AUTOMATED HIGHWAYS

VIRTUALLY ALL PROPOSED SYSTEMS FOR HIGHWAY AUTOMATION HAVE AT LEAST ONE MODE IN COMMON-STEADY-STATE CAR FOLLOWING. THE NATURE OF THIS MODE IS EXTREMELY IMPORTANT, AS IT CAN DETERMINE THE UPPER LIMIT OF FLOW DAPACITY OF AN AUTOMATED HIGHWAY. THIS LIMIT IS EXPLORED FOR A LINEAR HEADWAY CONTROLLER, AND A FUNDAMENTAL RELATION BETWEEN THE EFFECTIVE VEHICLE RESPONSE TIME AND THE PERMISSIBLE TRAFFIC STREAM DENSITY IS OBTAINED. THE REQUIRED INTERVEHICULAR SPACING WITH A LINEAR HEADWAY CONTROLLER IS SHOWN TO BE PROPORTIONAL TO THE EFFECTIVE VEHICLE TIME CONSTANT FOR SMALL-SIGNAL INPUTS; THUS, ONE CAN ACHIEVE SMALL SPACINGS AND HIGH FLOW RATES BY REDUCING THIS PARAMETER TO 1 SEC OR LESS. HOWEVER, THE VEHICLE IS THEN HIGHLY RESPONSIVE TO SMALL CHANGES IN LEAD-VEHICLE SPEED - POSSIBLY RESULTING IN BOTH PASSENGER DISCOMFORT AND POOR FUEL ECONOMY. THESE SHORTCOMINGS CAN BE AVOIDED BY USING A LINEAR VELOCITY CONTROLLER FOR AUTOMATIC CAR FOLLOWING. /AUTHOR/

  • Availability:
  • Supplemental Notes:
    • Vol 4, No 1, PP 52-63, 6 FIG, 7 REF, 1 APP
  • Corporate Authors:

    Operations Research Society of America

    428 East Preston Street
    Baltimore, MD  USA  21202
  • Authors:
    • Bender, J G
    • Fenton, R E
  • Publication Date: 0

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00227255
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM