00396834

Component

http://onlinepubs.trb.org...s/trr/1984/971/971-006.pdf

https://scholar.google.co....+Ou&publication_year=1984

Speed-flow relationship models for one-lane roads with two-way traffic are developed. Each model considers a composite variable of speed divided by the traffic distribution ratio as a dependent variable and both traffic distribution ratio and volume as independent variables. The traffic distribution ratio represents the degree of traffic conflict and is measured as the percentage of one-way traffic on the heavy-traffic direction to total traffic. A 1982 traffic survey of four study sites in the Mount St. Helens Monument region forms the data base. The following are specific findings of the study: (a) Model specification and coefficients, including elasticities, are stable. (b) The capacity of a single-lane road with turnouts may exceed 400 vehicles per day without reaching the congested-flowing situation when the majority of traffic is controlled by citizen band radios. (c) Speed is more sensitive to traffic distribution than to volume. (d) The predictive ability of the developed models has been validated at nine study sites with satisfactory results. The results of this study provide road engineers and managers some guidelines for selecting the most cost-effective design standard and management strategy for one-lane roads with turnouts.

Publication of this paper sponsored by Committee on Low-Volume Roads. 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

00452357

HS-038 732

pp 40-45

1984

Transportation Research Record

0309037530

Print

Figures (3) ; References (7) ; Tables (5)

Highway capacity; Traffic conflicts; Traffic distribution; Traffic flow; Traffic simulation; Traffic speed; Traffic volume; Two lane highways

Two way traffic

Highways; Operations and Traffic Management; I71: Traffic Theory

HSL, TRIS, TRB

Jan 31 1986 12:00AM

• ANALYSIS OF UNSIGNALIZED INTERSECTION CAPACITY
• ANOTHER LOOK AT STORAGE REQUIREMENTS FOR BANK DRIVE-IN FACILITIES
• AUTOMATED COLLECTION OF VEHICULAR DELAY DATA AT INTERSECTIONS
• CAPACITY, SPEED, AND PLATOONING VEHICLE EQUIVALENTS FOR TWO-LANE RURAL HIGHWAYS (DISCUSSION ANDD CLOSURE)
• COMPUTER SIMULATION TO COMPARE FREEWAY IMPROVEMENTS (ABRIDGMENT)
• DEVELOPMENT AND APPLICATION OF A MACROSCOPIC MODEL FOR RURAL HIGHWAYS
• DISCONTINUITY IN EQUILIBRIUM FREEWAY TRAFFIC FLOW
• DYNAMIC FREEWAY SIMULATION PROGRAM FOR PERSONAL COMPUTERS
• INVESTIGATION OF NETWORK-LEVEL TRAFFIC FLOW RELATIONSHIPS: SOME SIMULATION RESULTS
• LEFT-TURN EQUIVALENCIES FOR OPPOSED, SHARED, LEFT-TURN LANES
• LEVEL OF SERVICE CONCEPTS: DEVELOPMENT, PHILOSOPHIES, AND IMPLICATIONS
• PASSENGER CAR EQUIVALENTS FOR UNINTERRUPTED FLOW: REVISION OF CIRCULAR 212 VALUES
• ROLE OF ADAPTIVE DISCRETIZATION IN A FREEWAY SIMULATION MODEL
• SIGNALIZED INTERSECTION DELAY MODELS--A PRIMER FOR THE UNINITIATED
• SIMULATION OF TRAFFIC PERFORMANCE, VEHICLE EMISSIONS, AND FUEL CONSUMPTION AT INTERSECTIONS: THE TEXAS-II MODEL
• SIMULATION STUDY OF GUIDELINES FOR RURAL ROAD IMPROVEMENTS
• USE OF THE NCHRP SIGNALIZED INTERSECTION CAPACITY METHOD--A SOUTH AFRICAN EXPERIENCE
• VEHICLE-DETECTOR INTERACTIONS AND ANALYSIS OF TRAFFIC-ACTUATED SIGNAL CONTROLS