ANALYSIS OF A SIGNAL-CONTROLLED RAMP'S CHARACTERISTICS

ALTHOUGH IT IS EVIDENT WHICH MEASUREMENTS DESCRIBE AN UNCONTROLLED RAMP OPERATION, MEASUREMENTS RELEVANT TO DESCRIBING THE OPERATION OF A SIGNAL-CONTROLLED RAMP ARE NOT READILY APPARENT. A BASIC QUEUING APPROACH IS UTILIZED TO DEVELOP A MODEL ATTEMPTING TO DESCRIBE THE OPERATION OF A SIGNAL-CONTROLLED RAMP. THE ASSUMPTIONS OF POISSON ARRIVALS INTO THE RAMP, A NEGLIGIBLE MOVE-UP TIME IN THE QUEUE, AND AN ERLANG DISTRIBUTION OF FREEWAY GAPS INHERENT IN THE MODEL ARE VERIFIED BY STUDY MEASUREMENTS. A RATE OF SERVICE (WAIT AT THE SIGNAL) IS THEN PREDICTED FOR BOTH FIXED-RATE METERING AND GAP-ACCEPTANCE CONTROL. THE AVERAGE QUEUE AT THE RAMP SIGNAL IS ALSO PREDICTED FOR BOTH TYPES OF SIGNAL CONTROL. THE PREDICTED VALUES ARE COMPARED TO OBSERVED STUDY DATA. THE STUDY WAS CONDUCTED ON THE DUMBLE STREET INBOUND ENTRANCE RAMP ON THE GULF FREEWAY (INTERSTATE 45), HOUSTON, IN 1968. BECAUSE THE COMPUTERIZED DATA COLLECTION SYSTEM WAS NOT FULLY OPERATIONAL AT THE TIME THE STUDY WAS CONDUCTED, A FIELD DATA COLLECTION SCHEME WAS DEVELOPED TO MONITOR IN-PLACE LOOP DETECTORS. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 48-61
  • Monograph Title: Traffic flow characteristics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00225833
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 13 1970 12:00AM