00334161

Component

http://onlinepubs.trb.org...s/trr/1980/772/772-008.pdf

http://scholar.google.com...bach&publication_year=1980

The distribution of vehicle headways on two-lane, two-way roadways has been the subject of continuing research for a number of years. The growing interest in headway-generation models is related to the increased application of simulation techniques to describe traffic-flow patterns through the use of digital computers. A headway-distribution model developed for varying traffic-volume conditions (80-630 vehicles/h/lane) is described. The model was developed as part of a research project on the feasibility of using simulation techniques for depicting traffic flow on two-lane highways. A total of 18 sets of headway data (2 sets for each site) were collected from nine sites in North Carolina. The process of model development consisted of testing the field data by using a number of existing simple models and progressing with increasing degrees of complexity until an acceptable match between the field data and the model output was obtained. The study showed that none of the existing models (the Negative Exponential, Pearson Type III, and Schuhl models) provided satisfactory results for the wide range of traffic volumes tested. A modified form of the Schuhl model, incorporating parameters developed from the North Carolina data, provided the most reasonable approximation of the arrival patterns noted in the field. Parameters developed in the study are presented, along with a nomograph that can be used by traffic researchers to describe the time spacing between successive arrivals of vehicles on two-lane highways. (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 44-51

1980

Transportation Research Record

59th Annual Meeting of the Transportation Research Board

0309031168

Web

References (12) ; Tables (4)

Accuracy; Headways; Nomographs; Rural highways; Traffic simulation; Traffic volume; Two lane highways

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
• GENERALIZED PROCEDURE FOR ESTIMATING SINGLE- AND TWO-REGIME TRAFFIC-FLOW MODELS
• 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