FREEWAY LEVEL OF SERVICE AS INFLUENCED BY VOLUME AND CAPACITY CHARACTERISTICS
VOLUME CHARACTERISTICS AND CAPACITY CHARACTERISTICS AFFECT TRAFFIC OPERATION, AND THUS THE LEVEL OF SERVICE, ON FREEWAYS. UNDER THE FORMER, AN ANALYSIS OF SUCH PEAK-FLOW CHARACTERISTICS AS PEAK 5-MIN RATES OF FLOW, CORRELATION WITH POPULATION, AND A COMPARISON OF 2-HR VOLUMES WITH PEAK 1-HR VOLUMES ARE CONSIDERED. ALSO UNDER VOLUME CHARACTERISTICS WERE STUDIES OF LANE-USE DISTRIBUTION OF VEHICLES ON FREEWAYS. DATA WERE OBTAINED FROM 49 STUDY SITES LOCATED ON 14 DIFFERENT SIX-LANE FREEWAYS IN 10 STATES. PARAMETERS FOUND TO BE SIGNIFICANT WERE FREEWAY VOLUME, ENTRANCE RAMP VOLUME, UPSTREAM RAMP VOLUME, DISTANCE TO UPSTREAM RAMP, DOWNSTREAM RAMP VOLUME, AND DISTANCE TO DOWNSTREAM RAMP. IN DEALING WITH FREEWAY CAPACITY CHARACTERISTICS, A THEORETICAL APPROACH TO PROVIDING A RATIONAL RELATIONSHIP BETWEEN CAPACITY AND LEVEL OF SERVICE IS FORMULATED UTILIZING A HYDRO-DYNAMIC MODEL AND A MOMENTUM-ENERGY ANALOGY. THE THEORY IS VERIFIED AND ITS APPLICATION TOWARD A QUANTITATIVE DESCRIPTION OF LEVEL OF SERVICE IS SUGGESTED IN THE PREPARATION OF A TABLE OF FREEWAY DESIGN SERVICE VOLUMES TO BE USED IN DETERMINING FREEWAY MAIN LANE REQUIREMENTS. /AUTHOR/
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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:
- DREW, DONALD R
- Keese, Charles J
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Discussers:
- May Jr, Adolf D
- Moskowitz, Karl
- Hess, J W
- DREW, DONALD R
- Keese, Charles J
- Publication Date: 1965
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 1-47
- 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; Distance; Freeways; Highway capacity; Hydrodynamics; Interchange ramps; Level of service; Mathematical models; Ramps; Theory; Traffic; Traffic flow; Traffic volume; Vehicles; Volume
- Uncontrolled Terms: Models; Traffic analysis
- Old TRIS Terms: Freeway entrances and exits; Lane-use distribution; Momentum-energy analogy; Quantitative description
- Subject Areas: Highways; Hydraulics and Hydrology; Operations and Traffic Management; Vehicles and Equipment;
Filing Info
- Accession Number: 00224756
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Dec 12 1994 12:00AM