00675339

Component

http://onlinepubs.trb.org...trr/1994/1445/1445-015.pdf

https://scholar.google.co...itel&publication_year=1994

Guidelines for the use of right-turn lanes at access points on urban two-lane and four-lane roadways were developed. The guidelines define the design-hour traffic volumes for which the benefits of right-turn lanes exceed their costs. The benefits used in the analysis were the operational and accident cost savings that right-turn lanes provide road users. The operational cost savings were those associated with the reductions in stops, delays, and fuel consumption experienced by through traffic. The accident cost savings were those associated with the reduction in accidents expected from the lower speed differentials between right-turning and through traffic. The guidelines define the right-turn design-hour volume required to justify a right-turn lane as a function of the following factors: (a) directional design-hour volume, (b) roadway speed, (c) number of lanes on the roadway, and (d) right-of-way cost. Comparison with guidelines developed by others indicates that the guidelines developed in the research are within the range of existing guidelines. In addition they are more definitive than the other guidelines because they account for the effects of roadway speed and right-of-way costs.

This paper appears in Transportation Research Record No. 1445, Cross Section and Alinement Design Issues. 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

01401257

English

p. 130-137

1994

Transportation Research Record

0309060516

Figures (3) ; References (18) ; Tables (2)

Bus stops; Cost control; Design hourly volume; Four lane highways; Fuel consumption; Guidelines; Right of way (Land); Right turn lanes; Safety; Speed; Stopping; Traffic delays; Traffic safety; Two lane highways; Urban highways

Cost savings

Design; Energy; Highways; Public Transportation; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure

TRIS, TRB, ATRI

Mar 20 1995 12:00AM

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