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原文传递 Methodologies for Estimating Advisory Curve Speeds on Oregon Highways.

题名：	Methodologies for Estimating Advisory Curve Speeds on Oregon Highways.
作者：	dixon, k. rohani, j.
关键词：	advisory speed,traffic speeds,curve warnings,advisory speeds/warning signs, speed signs, rural highways, highway curves, methodologies, estimating, identification, marking, horizontal curves, oregon/ball-bank devices, modified advisory speed thresholds
摘要：	This report reviews an Oregon research effort to evaluate the identification and marking of advisory speeds on Oregon highways. In particular, this research effort focused on the implications of modified advisory speed thresholds and identification procedures following the most recent and the upcoming MUTCD and the Traffic Control Devices (TCD) Handbook recommendations. The primary objectives of this research effort were to help identify the basis for the current and proposed advisory speed posting procedures (with specific attention to the horizontal curve location on rural roads and passenger vehicle condition), to evaluate Oregon placement strategies at a variety of locations, and to identify potential criteria for establishing advisory speeds for these curved sections on Oregon highways. Included with this evaluation is an assessment of associated costs for implementation of a modified advisory speed policy in Oregon. Through the use of both manual and digital ball-bank devices, the report identifies compliance of current and future advisory speed thresholds for both State- and county-maintained roads, expected costs for upgrading State-maintained facilities, evaluation of alternative computational methods, and an assessment of the differences observed between the two different ball-bank devices. / NOTE: Final rept. / Supplementary Notes: Sponsored by Oregon Dept. of Transportation, Salem. Research Unit. and Federal Highway Administration, Washington, DC. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
报告类型：	科技报告