00222658

Component

http://onlinepubs.trb.org...s/hrr/1967/208/208-001.pdf

THE FIRST PHASE OF A 4-YR PROGRAM ON FREEWAY MERGING WAS UNDERTAKEN BY THE BUREAU OF PUBLIC ROADS TO FURNISH MORE DETAILED INFORMATION ON THE EFFECT OF GEOMETRIC VARIABLES ON MERGING OF RAMP TRAFFIC, TO DEVELOP USABLE DISTRIBUTIONS OF TRAFFIC VARIABLES FOR SIMULATION PROGRAMS, AND TO DEVELOP AN OPTIMUM RAMP METERING AND MERGING CONTROL SYSTEM. EMPHASIS IS ON COLLECTION AND COLLATION OF GAP ACCEPTANCE CHARACTERISTICS. THE THEORETICAL DEVELOPMENT OF MODELS AND USEFUL PARAMETERS FOR DESCRIBING THE MERGING PROCESS INCLUDE THE DERIVATION OF THE FORMS OF THE MEAN AND VARIANCE OF THE DELAY TO A RAMP VEHICLE IN POSITION TO MERGE AND THE TREATMENT OF THE VARIABILITY OF CRITICAL GAPS AND GAP ACCEPTANCE AMONG DRIVERS THROUGH THE IDENTIFICATION OF THE REPRESENTATIVE FORMS FOR BOTH CRITICAL GAP DISTRIBUTIONS AND GAP ACCEPTANCE FUNCTIONS. THROUGH APPLICATION OF INDIVIDUAL RECORD PROBIT ANALYSES, SIMPLE, STATISTICALLY SIGNIFICANT RELATIONSHIPS BETWEEN THE PERCENT GAP ACCEPTANCE AND GAP SIZE ARE ESTABLISHED. THE CHARACTERISTICS OF LAGS AND GAPS AND SINGLE AND MULTIPLE-ENTRY MERGES ARE COMPARED, AS WELL AS FAST TO SLOW MOVING MERGING VEHICLES. THE PROBIT ANALYSES ARE GENERALIZED TO ESTABLISH A RELATIONSHIP BETWEEN PERCENT ACCEPTANCE AS THE DEPENDENT VARIABLE AND GAP SIZE AND VEHICULAR SPEED AS THE DEPENDENT VARIABLES. /AUTHOR/

Paper sponsored by Committee on Characteristics of Traffic Flow and presented at the 46th Annual Meeting. 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.

01410156

pp 1-36

1967

Highway Research Record

Digital/other

Figures (18) ; References (23) ; Tables (8)

Gap acceptance; Geometric design; Interchange ramps; Mathematical models; Merging traffic; Percent; Probits; Simulation; Size; Speed; Statistical analysis; Traffic control; Vehicles

Models; Parameters

Data and Information Technology; Highways; Operations and Traffic Management; Safety and Human Factors; Vehicles and Equipment

TRIS, TRB

Feb 20 1994 12:00AM

• OPERATIONAL EFFECTS OF SOME ENTRANCE RAMP GEOMETRICS ON FREEWAY MERGING
• The Development and Validation of a Digital Simulation Model for Design of Freeway Diamond Interchanges