00225540

Component

http://onlinepubs.trb.org...s/hrr/1969/279/279-007.pdf

USING THE GULF FREEWAY IN HOUSTON AS THE LABORATORY, A NUMBER OF TRAFFIC CHARACTERISTICS ASSOCIATED WITH GAP ACCEPTANCE CONTROL WERE STUDIED. DATA COLLECTION WAS PERFORMED USING MANUAL METHODS, A CLOSED-CIRCUIT TELEVISION SYSTEM, AND AN ELECTRONIC DATA ACQUISITION SYSTEM INCLUDING FIELD SENSORS AND A DIGITAL COMPUTER. THE RAMP TRAFFIC CHARACTERISTICS PRESENTED INCLUDE THE VEHICLE PERFORMANCE CHARACTERISTICS OF SPEED, ACCELERATION, AND TRAVEL TIME, THE RELATIONSHIPS AMONG THESE VARIABLES, AND THE EFFECTS OF VEHICLE TYPE AND RAMP GRADE ON THESE VARIABLES. THE BEHAVIOR OF RAMP VEHICLES AT THE CONTROL SIGNAL WAS ALSO STUDIED TO DETERMINE THE STARTING-DELAY CHARACTERISTICS AND STOPPING POSITION OF VEHICLES AT THE RAMP SIGNAL. A FREQUENCY DISTRIBUTION OF EACH VARIABLE IS PRESENTED AND THE APPLICATION OF THE RESULTS IN THE IMPLEMENTATION AND CALIBRATION OF MERGING CONTROL SYSTEMS IS DISCUSSED. SEVERAL FREEWAY TRAFFIC CHARACTERISTICS WERE ALSO STUDIED. THESE WERE CONCERNED MAINLY WITH TRAFFIC STABILITY UPSTREAM FROM AN ENTRANCE RAMP AND THE EFFECT OF THIS STABILITY ON THE ACCURACY WITH WHICH THE TRAJECTORY OF A RAMP VEHICLE CAN BE MATCHED WITH A FREEWAY GAP. ALSO PRESENTED IS THE RELATIONSHIP BETWEEN TOTAL TRAVEL AND TOTAL TRAVEL TIME, TWO MEASURES OF EFFECTIVENESS OFTEN USED IN THE EVALUATION OF FREEWAY CONTROL SYSTEMS. THE POSSIBLE APPLICATION OF THIS RELATIONSHIP IN THE DEVELOPMENT OF WARRANTS FOR FREEWAY CONTROL IS INDICATED. /AUTHOR/

Paper sponsored by Committee on Characteristics of Traffic Flow and presented at the 48th 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

01410219

Paper No 1

pp 87-106

1969

Highway Research Record

Print

Figures (24) ; References (11) ; Tables (5)

Acceleration (Mechanics); Closed circuit television; Data collection; Digital computers; Freeway operations; Gap acceptance; Information processing; Interchange ramps; Speed; Traffic control; Traffic flow; Travel time; Vehicle performance

Highways; Operations and Traffic Management

TRIS, TRB

Oct 21 1994 12:00AM

• A MOVING VEHICLE MERGING CONTROL SYSTEM
• A SIMULATION MODEL OF LANE-CHANGING ON A MULTILANE HIGHWAY
• AIRPORT DEMAND CHARACTERISTICS AFFECTING FREEWAY OPERATIONS
• AN ANALYSIS OF SHORT-TERM IMPLEMENTATION OF RAMP CONTROL ON THE DAN RYAN EXPRESSWAY
• Analysis of Wrong-Way Incidents on Michigan Freeways- Abridgment
• AUTOMATIC FREEWAY SURVEILLANCE AND EVALUATION TECHNIQUES
• DESIGN OF FREEWAY ENTRANCE RAMP MERGING CONTROL SYSTEMS
• Development and Evaluation of Experimental Information Signs
• DUAL MODE BEHAVIOR OF FREEWAY TRAFFIC
• LANE-CHANGING IN MULTILANE FREEWAY TRAFFIC
• MULTILEVEL APPROACH TO THE DESIGN OF A FREEWAY CONTROL SYSTEM
• RAMP CAPACITY AND SERVICE VOLUME AS RELATED TO FREEWAY CONTROL
• RAMP CONTROL ON FREEWAYS IN CALIFORNIA
• RESPONSE TO A CB RADIO DRIVER AID NETWORK
• Response to a CD Radio Drive Aid Network
• Service Signing and Motorist's Choice
• SOME DESIGN CONSIDERATIONS OF DIGITAL COMPUTER CONTROL SYSTEMS APPLIED TO FREEWAY TRAFFIC OPERATIONS
• SOME ELECTRONIC MEASUREMENTS OF MACROSCOPIC TRAFFIC CHARACTERISTICS ON A MULTILANE FREEWAY
• TRAFFIC CONTROL ON A TWO-LANE, HIGH-SPEED, HIGH VOLUME FREEWAY ENTRANCE