Candidate Signal Warrants From Gap Data

Author : Louis G. Neudorff
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.3/5 (555 download)

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Download or read book Candidate Signal Warrants from Gap Data written by Louis G. Neudorff and published by . This book was released on 1983 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a method of determining the need for a traffic signal using site-specific information on gaps in the major road traffic. Formulas relating delay to the ratio of side street volume and gaps available on the major road (analagous to the volume/capacity ratio) were derived from data collected at 43 intersections using automatic gap counters. The formulas were further validated at 18 intersections. The results show that the volume to gap ratio is an accurate estimator of side street delay and that the gap based warrant is an accurate indicator of signal need when compared to engineering judgement. The method consists of collecting the number and size of gaps during a four hour period using a modified volume counter or commercially available gap counter. Using known information about driver gap acceptance, the gap data is converted to an equivalent number of adequate gaps (known as the gap availability parameter). The side street volume and gap availability parameter are plotted on an analysis diagram which shows average side street delay. If the average side street delay exceeds the threshold value of tolerable delay for the community (e.g., 25 seconds per vehicle) then a signal may be warranted. Gap-based signal warrants for peak hour conditions and pedestrian considerations are also included.