DIAMOND INTERCHANGE TRAFFIC CONTROL. VOL 16. SUMMARY REPORT ON CONTROL AND GEOMETRIC DESIGN OF DIAMOND INTERCHANGES

A COMPREHENSIVE INVESTIGATION OF THE DESIGN AND OPERATION OF SIGNALIZED DIAMOND INTERCHANGES INCLUDING THE NEARBY SIGNALIZED INTERSECTIONS WAS CONDUCTED. A SUMMARY OF THE PRINCIPAL FINDINGS FROM THIS INVESTIGATION IS PRESENTED IN THIS REPORT. THE GEOMETRICS AND SIGNALIZATION CHARACTERISTICS OF A LARGE REPRESENTATIVE SAMPLE OF EXISTING DIAMOND INTERCHANGES IS FIRST DISCUSSED. DIGITAL COMPUTER SIMULATION MODELS OF TRAFFIC OPERATIONS IN DIAMOND INTERCHANGES (INCLUDING THE NEARBY SIGNALIZED INTERSECTIONS) WERE DEVELOPED. THESE SIMULATION MODELS WERE COMPREHENSIVE VALIDATED AGAINST AERIALLY-COLLECTED TIME-LAPSE PHOTOGRAPHIC DATA. THESE MODELS WERE USED, IN TURN, TO PERFORM SEVERAL SUBSTUDIES. OPTIMUM SIGNAL CONTROL METHODOLOGY WAS DEVELOPED WHICH WAS EVALUATED THROUGH THE USE OF THESE MODELS. THE PREDICTIVE QUALITY OF THESE MODELS WAS DEMONSTRATED THROUGH THE PERFORMANCE OF BEFORE-AND-AFTER SIMULATION AND FIELD STUDIES. A PRETIMED SIGNAL CONTROL DESIGN MANUAL WAS A NATURAL OUTCOME OF THESE SERIES OF STUDIES. THE PROGRAM CULMINATED IN THE DESIGN, DEVELOPMENT, AND IMPLEMENTATION OF A SECOND-GENERATION COMPUTERIZED TRAFFIC CONTROL SYSTEM ON AN OPERATIONAL INTERCHANGE IN THE CITY OF LOS ANGELES WHICH PRODUCED SUBSTANTIAL IMPROVEMENTS IN OPERATIONAL PERFORMANCE.

• Corporate Authors:

  System Development Corporation

  2500 Colorado Avenue
  Santa Monica, CA  United States  90409
• Authors:
  • Torres, J F
• Publication Date: 1973-7

Media Info

• Pagination: 33 p.
• Serial:
  • Volume: 16

Subject/Index Terms

• TRT Terms: Cost effectiveness; Diamond interchanges; Information processing; Real time control; Simulation; Time lapse photography; Traffic control; Traffic control devices; Traffic delays; Traffic surveillance
• Old TRIS Terms: Real-time systems; Traffic control systems
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225056
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA-RD-73- 65 Final Rpt., FCP 32E1-522
• Contract Numbers: FH-11-7568
• Files: TRIS, USDOT
• Created Date: Apr 3 1976 12:00AM