00471924

Component

http://onlinepubs.trb.org...trr/1986/1091/1091-012.pdf

https://scholar.google.co...over&publication_year=1986

The objectives of this study were to develop estimates of the saturation flows of exclusive double left-turn lanes, and to investigate the physical and operating characteristics of the intersection that may affect left-turn saturation flows. The results are based on observations of 3,458 completed left turns from exclusive double left-turn lanes on 14 intersection approaches in Austin, College Station, and Houston, Texas. Based on the results of this study and a review of the data from a limited number of related studies, an average double left-turn saturation flow rate of approximately 1,600 vehicles per hour of green per lane would appear to be a reasonable value for most planning applications. This flow rate can be assumed to be achieved for the third vehicle in the queue and beyond. Also, this flow rate appears to be applicable for mixed traffic conditions in which heavy vehicles constitute as much as 3 to 5 percent of the left-turn traffic volume.

Publication of this paper sponsored by Committee on Highway Capacity and Quality of Service. 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

01418821

pp 86-95

1986

Transportation Research Record

65th Annual Meeting of the Transportation Research Board

0309041112

Print

Figures (2) ; References (11) ; Tables (8)

Flow; Heavy vehicles; Highway planning; Left turn lanes; Percent saturation; Queuing; Traffic; Traffic flow; Traffic surveys; Traffic volume

Flow rate; Traffic studies

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB

Jul 31 1988 12:00AM

• A COMPARISON OF THE 1985 HIGHWAY CAPACITY MANUAL AND THE SIGNAL OPERATIONS ANALYSIS PACKAGE 84
• A MODEL FOR PREDICTING FREE-FLOW SPEEDS BASED ON PROBABILISTIC LIMITING VELOCITY CONCEPTS: THEORY AND ESTIMATION
• ANALYSIS OF THE PROPOSED USE OF DELAY-BASED LEVELS OF SERVICE AT SIGNALIZED INTERSECTIONS
• COMPARATIVE ANALYSIS OF MODELS FOR ESTIMATING DELAY FOR OVERSATURATED CONDITIONS AT FIXED-TIME TRAFFIC SIGNALS
• ENTERING HEADWAY AT SIGNALIZED INTERSECTIONS IN A SMALL METROPOLITAN AREA
• FIELD VALIDATION OF INTERSECTION CAPACITY FACTORS
• FREESIM: A MICROSCOPIC SIMULATION MODEL OF FREEWAY LANE CLOSURES (ABRIDGMENT)
• FREEWAY WEAVING SECTIONS: COMPARISON AND REFINEMENT OF DESIGN AND OPERATIONS ANALYSIS PROCEDURES
• FURTHER ANALYSIS OF THE FLOW-CONCENTRATION RELATIONSHIP
• INTEGRATED MODELING OF FREEWAY FLOW AND APPLICATION TO MICROCOMPUTERS (ABRIDGMENT)
• PASSENGER CAR EQUIVALENTS FOR TRUCKS ON LEVEL FREEWAY SEGMENTS
• PEAKING CHARACTERISTICS OF RURAL ROAD TRAFFIC
• STATISTICAL ANALYSIS OF OUTPUT RATIOS IN TRAFFIC SIMULATION
• TRAFFIC OPERATION ON BUSY TWO-LANE RURAL ROADS IN THE NETHERLANDS
• TRANSITIONS IN THE SPEED-FLOW RELATIONSHIP (ABRIDGMENT)
• USE AND EFFECTIVENESS OF SIMPLE LINEAR REGRESSION TO ESTIMATE SATURATION FLOWS AT SIGNALIZED INTERSECTIONS