00489695

Component

http://onlinepubs.trb.org...trr/1988/1195/1195-011.pdf

https://scholar.google.co...luri&publication_year=1988

European design guidelines explicitly address horizontal design consistency for two-lane, rural roads in an attempt to promote smooth operating speed profiles and, in turn, safe operation. U.S. practice qualitatively advocates consistent alignment but provides little objective guidance to assure that consistency is achieved. This paper presents a procedure for measuring the consistency of horizontal design as defined by operating speed and accidents expected. Operating speeds and accident rates can be predicted for various lane widths based on degree of curve and posted recommended speeds, as derived from measurement of 261 sites in New York state. Guidelines for changes in operating speeds and acceptable accident rates for good, fair, and poor designs are suggested, and various nomographs are developed to evaluate roadway sections based on design parameters. In addition, an example application is provided to illustrate the case of fair design practices. It is concluded that such a procedure could readily be adapted by the design community in prescribing improvements to existing facilities or in fine tuning new highway design.

This paper appears in Transportation Research Record No. 1195, Geometric Design and Operational Effects. 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

01413994

p. 111-122

1988

Transportation Research Record

0309047609

Figures (5) ; References (21) ; Tables (3)

Alignment; Case studies; Crash rates; Geometric design; Guidelines; Highway design; Nomographs; Operating speed; Rural highways; Two lane highways

Horizontal alignment

Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure

TRIS, TRB, ATRI

Nov 30 1989 12:00AM

• ACCIDENT EFFECTS OF SIDESLOPE AND OTHER ROADSIDE FEATURES ON TWO-LANE ROADS
• COMPUTER SIMULATION STUDY OF THE OPERATIONAL EFFECTS OF TWO-WAY LEFT-TURN LANES ON URBAN FOUR-LANE ROADWAYS
• DESIGN GUIDE FOR AUXILIARY PASSING LANES ON RURAL TWO-LANE HIGHWAYS
• DEVELOPMENT OF LIMITING VELOCITY MODELS FOR THE HIGHWAY PERFORMANCE MONITORING SYSTEM (ABRIDGMENT)
• EFFECTIVE USE OF PASSING LANES ON TWO-LANE HIGHWAYS
• EFFECTS OF TURNS BY LARGER TRUCKS AT URBAN INTERSECTIONS
• INTERSECTION CHANNELIZATION GUIDELINES FOR LONGER AND WIDER TRUCKS
• MAGNITUDE AND SEVERITY OF DRAINAGE-STRUCTURE-RELATED HIGHWAY ACCIDENTS (ABRIDGMENT)
• NEW AND IMPROVED MODEL OF PASSING SIGHT DISTANCE ON TWO-LANE HIGHWAYS
• SAFETY EFFECTS OF CROSS-SECTION DESIGN FOR TWO-LANE ROADS
• TANGENT AS AN INDEPENDENT DESIGN ELEMENT
• TWO-WAY LEFT-TURN LANE GUIDELINES FOR URBAN FOUR-LANE ROADWAYS
• UNIFORM DELAY APPROACH TO WARRANTS FOR CLIMBING LANES