RAMP-FREEWAY TERMINAL OPERATION AS RELATED TO FREEWAY LANE VOLUME DISTRIBUTION AND ADJACENT RAMP INFLUENCE
ANALYSIS OF THE DATA COLLECTED DURING THE NATIONWIDE FREEWAY RAMP CAPACITY STUDY AND A 1963 NATIONWIDE STUDY OF WEAVING AREAS IS PRESENTED. THE EMPHASIS IN THIS REPORT IS ON EQUATIONS FOR DETERMINING TRAFFIC VOLUMES IN LANE 1, THE RIGHT-HAND FREEWAY LANE, AT MERGING AND DIVERGING SECTIONS ALONG THE FREEWAY. THE MAIN PREMISE IS THAT IF THE LANE 1 VOLUME CAN BE KEPT AT AN ACCEPTABLE LEVEL, THE FREEWAY AS A WHOLE WILL BE OPERATING FREE-FLOW. AUXILIARY LANE USAGE BETWEEN ON- AND OFF-RAMPS IS DISCUSSED AND A METHOD OF CAPACITY ANALYSIS IS ILLUSTRATED WITH A SAMPLE PROBLEM. TWO- LAND ON-RAMP OPERATION IS ANALYZED FROM THE STANDPOINT OF THE MULTIPLE MERGES TAKING PLACE. WHILE DATA ON MAJOR FORK OPERATION WERE VERY SPARSE, ONE EQUATION WAS DERIVED TO ENABLE FORECASTING OF LANE VOLUME DISTRIBUTIONS UPSTREAM FROM A DIVERGING MAJOR FORK WHERE THREE LANE SPLIT INTO TWO, TWO-LAND ROADWAYS. RESULTS ARE GIVEN OF ON-RAMP VEHICLE FREEWAY LANE USAGE STUDIES MADE IN DETROIT ON THE 6-LAND EDSEL FORD EXPRESSWAY. REFERENCES' CAPACITIES AND CHARACTERISTICS OF RAMP-FREEWAY CONNECTIONS , HIGHWAY RESEARCH RECORD NO. 27.
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Hess, Joseph W
- Publication Date: 1965
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 81-116
- Monograph Title: Freeway characteristics, operations and accidents
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Serial:
- Highway Research Record
- Issue Number: 99
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Analysis; Auxiliary lanes; Data collection; Highway capacity; Interchange ramps; Mathematical analysis; Ramps; Traffic flow; Traffic volume; Volume
- Old TRIS Terms: Free-flow; Freeway ramps; Volume determination
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00224753
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Feb 9 1994 12:00AM