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Title: SELECTION OF DESIGN SPEED VALUES
Accession Number: 00933650
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: A revised definition for design speed has been adopted by the American Association of State Highway and Transportation Officials (AASHTO) and included in the 2001 Green Book. Although this revised definition addresses several concerns, it does not include guidance on how to select the most appropriate design speed value. A summary of AASHTO policy, state practices, and international practices with regard to design speed selection demonstrates substantial variation in the processes used to select design speed. An analysis performed using operating speed as the measure of effectiveness validates some of the AASHTO criteria used to select design speed. However, the analysis also indicates that terrain (one of the AASHTO criteria used to select design speed) may not be related to operating speed, and its inclusion in the design speed selection process is justified in roadway cost considerations. Four possible solutions are presented for selecting the most appropriate design speed value for a better relationship between design speed and operating speed.
Supplemental Notes: This paper appears in Transportation Research Record No. 1796, Geometric Design and the Effects on Traffic Operations 2002.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Fitzpatrick, KCarlson, PPagination: p. 3-11
Publication Date: 2002
Serial: ISBN: 0309077214
Features: Figures
(4)
; References
(10)
; Tables
(5)
TRT Terms: Identifier Terms: Uncontrolled Terms: Subject Areas: Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure
Files: TRIS, TRB, ATRI
Created Date: Nov 7 2002 12:00AM
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