|
|
|
Title: CONSISTENCY OF HORIZONTAL ALIGNMENT FOR DIFFERENT VEHICLE CLASSES
Accession Number: 00715006
Record Type: Component
Availability: Find a library where document is available Abstract: The objective of this study was to develop guidelines for evaluating the consistency of horizontal alignment of two-way two-lane highways. A number of simple and continuous horizontal curves were selected for this purpose. Roadway geometric design variables were obtained from design plans and field measurements. The speed of passenger cars, light trucks, and trucks was measured on tangent and horizontal curves. In the analysis, the speed reduction between tangent and curve or successive curves was considered the inconsistency indicator. The results of the analysis indicate that the degree of curve, length of vertical curve, gradient, and pavement condition have a significant effect on consistency of simple horizontal curves. For successive curves separated by a short common tangent, the speed reduction was found to be highly affected by the radii of curves. Also, the results reveal that a good consistent design can be achieved if the radii of successive curves are equal. Finally, the speeds on a common tangent between successive curves are investigated. For each type of vehicle, the results indicate that the degree of successive curves and the tangent length significantly influence the speed on the common tangent.
Supplemental Notes: This paper appears in Transportation Research Record No. 1500, Geometric Design, Roadside Safety Features, Roadside Hardware Monitoring, and Scenic Loop Tours. 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
Monograph Title: Geometric design, roadside safety features, roadside hardware monitoring, and scenic loop tours Monograph Accession #: 01399820
Language: English
Authors: Al-Masaeid, Hashem RHamed, MohammadAboul-Ela, MohammadGhannam, Adnan GPagination: p. 178-183
Publication Date: 1995
Serial: Features: Figures
(3)
; References
(17)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Design; Highways; Pavements; I20: Design and Planning of Transport Infrastructure
Files: TRIS, TRB
Created Date: Dec 26 1995 12:00AM
More Articles from this Serial Issue:
|
