00334159

Component

http://onlinepubs.trb.org...s/trr/1980/772/772-006.pdf

http://scholar.google.com...+May&publication_year=1980

Macroscopic traffic-flow models play an important role in the planning, design, and operation of transportation facilities. Evaluation of these models is often required to select the appropriate model that best represents prevailing operating conditions. For this purpose, a technique is needed that will enable the analyst to easily and quickly estimate model parameters. The technique should be easy to understand and use and inexpensive to apply and should generate results that reasonably represent actual traffic behavior. The development of such a technique is described. The proposed estimation procedure is based principally on the theoretical relations between model parameters and traffic-flow criteria. Such relations were developed for both single- and two-regime approaches. To facilitate use of the procedure, generalized nomographs were developed to model the complexity of the theoretical aspects involved. These nomographs are capable of directly providing the values of model parameters that satisfy specified evaluation criteria. This procedure significantly reduces the need for regression analysis in estimating model parameters and thus appears to be of particular use in a wide range of transportation applications. (Author)

Publication of this paper sponsored by Committee on Traffic Flow Theory and Characteristics. 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.

01411592

pp 24-37

1980

Transportation Research Record

59th Annual Meeting of the Transportation Research Board

0309031168

Web

Figures (13) ; References (16)

Accuracy; Estimating; Nomographs; Traffic flow; Traffic simulation

Macroscale

Highways; Operations and Traffic Management; I71: Traffic Theory

TRIS, TRB

Oct 28 1981 12:00AM

• CHANGES IN TRAFFIC SPEED AND BUNCHING NEAR TRANSITION POINTS BETWEEN TWO- AND FOUR-LANE RURAL ROADS (ABRIDGMENT)
• DETERMINING THE LATERAL DEPLOYMENT OF TRAFFIC ON AN APPROACH TO AN INTERSECTION
• DEVELOPMENT OF A NEW TRAFFIC-FLOW DATA-COLLECTION SYSTEM (ABRIDGMENT)
• DEVELOPMENT OF A TRANSYT-BASED TRAFFIC SIMULATION MODEL (ABRIDGMENT)
• DEVELOPMENT OF MODIFIED PROCEDURES FOR ANALYSIS OF RAMP CAPACITY
• EFFECT OF ON-STREET PICKUP AND DELIVERY ON LEVEL OF SERVICE OF ARTERIAL STREETS
• HEADWAY-DISTRIBUTION MODELS FOR TWO-LANE RURAL HIGHWAYS
• HYBRID MACROSCOPIC-MICROSCOPIC TRAFFIC SIMULATION MODEL (ABRIDGMENT)
• PROJECTED VEHICLE CHARACTERISTICS THROUGH 1995
• REVISION OF NCHRP METHODOLOGY FOR ANALYSIS OF WEAVING-AREA CAPACITY
• SERVICE RATES OF MIXED TRAFFIC ON THE FAR LEFT LANE OF AN APPROACH
• TRAFLO: A NEW TOOL TO EVALUATE TRANSPORTATION SYSTEM MANAGEMENT STRATEGIES