HEADWAY SENSING FOR AUTOMATICALLY CONTROLLED AND GUIDED VEHICLES

THE REPORT ASSESSES THE STATE-OF-THE-ART IN HEADWAY SENSING AND SIGNAL CONDITIONING APPLICABLE TO SINGLE-MODE, AUTOMATICALLY CONTROLLED GUIDEWAY VEHICLES (ACGV) OPERATING AT LESS THAN THREE TIMES THE REQUIRED STOPPING DISTANCE FROM A SECOND VEHICLE. HEADWAY MEASUREMENT APPROACHES BREAK DOWN INTO THREE GENERAL CATEGORIES: (1) VEHICLE-MOUNTED SYSTEMS; (2) GUIDEWAY-MOUNTED SYSTEMS, AND (3) PROFILE CONTROL. ALL AVAILABLE OR POTENTIALLY AVAILABLE SYSTEMS ARE INCLUDED WHICH CAN OPERATE SAFELY UNDER THE FOLLOWING SYSTEM PARAMETERS: (1) MEASUREMENT DISTANCES FROM 10 TO 500 FEET; (2) VEHICLE SPEEDS FROM 10 TO 60 MPH; (3) VEHICLE CAPACITY FROM 2 TO 15 PASSENGERS; (4) VEHICLE ACCELERATIONS LESS THAN 0.3 G, AND (5) LINE CAPACITIES OF 6,000 TO 45,000 PEOPLE PER HOUR. THE REPORT LISTS FOR EACH SYSTEM PHYSICAL CHARACTERISTICS SUCH AS ACCURACY, SIZE, RELIABILITY, AND POWER; DIGITAL COMPUTATION AND SIGNAL CONDITIONING EQUIPMENT; SYSTEM FUNCTIONAL FLOW DIAGRAM; SYSTEM COSTS, AND SIGNIFICANT COMMUNICATION, DATA HANDLING, AND DATA ENCODING/CODING PROBLEMS. THE SURVEY STRESSES NEAR-TERM APPLICATION OF VEHICLE-BORNE MICROWAVE SENSORS, WAYSIDE DETECTION, AND SENSING NETS TO MEASURE RANGE AND RANGE RATE BETWEEN VEHICLES. /TRRL/

• Corporate Authors:

  Johns Hopkins University, Laurel

  Applied Physics Laboratory, 11100 Johns Hopkins Road
  Laurel, MD  United States  20723-6099
• Publication Date: 1970-9

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 211 p.

Subject/Index Terms

• TRT Terms: Acceleration (Mechanics); Automated vehicle control; Automatic control; Headways; Physical condition; Signals; Speed; State of the art studies; Stopping distances; Vehicle capacity
• Uncontrolled Terms: Guided vehicles
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00224658
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: HS-010 188
• Files: HSL, TRIS
• Created Date: Jul 8 1973 12:00AM