EVALUATION OF FREEWAY TRAFFIC FLOW OF RAMPS, COLLECTOR ROADS, AND LANE DROPS (THE COLLECTOR ROAD STUDY)
THIS STUDY WAS DESIGNED TO MAKE AN EVALUATION OF FREEWAY TRAFFIC FLOW CHARACTERISTICS FOR SEVERAL HIGH STANDARD GEOMETRIC DESIGN FEATURES. THE STUDY EVALUATES AND COMPARES THE EFFECT OF DIFFERENT RAMP TYPES, SPACING, AND VOLUMES ON FREEWAY CAPACITY AND OPERATION. COLLECTOR-DISTRIBUTOR ROADS, AUXILIARY LANES, AND LANE DROPS ARE INCLUDED. THE PRIMARY MEASURE OF EFFECTIVENESS USED FOR THIS STUDY WAS DENSITY (VEHICLES PER LANE-MILE). DENSITY WAS CHOSEN RATHER THAN SPEED BECAUSE IT IS A BETTER INDICATION OF DRIVING CONDITIONS. THE MAJOR FINDING OF THIS STUDY IS THAT FREEWAY DESIGNS THAT OFFER GREATER FLEXIBILITY (FREEDOM OF CHOICE TO THE DRIVERS) WILL RESULT IN SMOOTHER AND MORE EFFICIENT OPERATION. FOR EXAMPLE, A FREEWAY WITH AUXILIARY LANES HAS GREATER FLEXIBILITY THAN A FREEWAY WITH A COLLECTOR ROAD SYSTEM WITH THE SAME TOTAL NUMBER OF LANES. IT ALSO HAS GREATER CAPACITY AND MORE EFFICIENT OPERATION. /AUTHOR/
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Supplemental Notes:
- RES RPT C-3-1
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Corporate Authors:
California Division Highways
/Traffic Department
, United States -
Authors:
- Martin, D B
- Ewman, L
- Johnson, R T
- Publication Date: 1972-4
Media Info
- Pagination: 93 p.
Subject/Index Terms
- TRT Terms: Auxiliary lanes; Density; Freeway operations; Freeways; Geometric design; Highway capacity; Interchange ramps; Location; Spacing; Speed; Streets; Traffic flow; Traffic lanes; Travel patterns; Volume
- Uncontrolled Terms: Traffic patterns
- Old TRIS Terms: Collector distributor roads; Freeway capacity; Ramp location & spacing
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00227376
- Record Type: Publication
- Files: TRIS, STATEDOT
- Created Date: Apr 8 1973 12:00AM