Safety evaluation of curve warning speed signs - Appendices
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|Title:||Safety evaluation of curve warning speed signs.|
Dixon, Karen, author.
Avelar, Raul, author.
Oregon State University School of Civil and Construction Engineering,, issuing body.
Oregon Department of Transportation. Research Section,, sponsoring body.
United States Federal Highway Administration,, sponsoring body.
Oregon Transportation Research and Education Consortium, sponsoring body.
|Type of Resource:||text|
|Date Issued:||June 2011.|
|Publisher:||Oregon State University, School of Civil and Construction Engineering,|
|Place of Publication:||Corvallis, Or. :|
|Extent:||1 online resource (2 volumes) : color illustrations, color maps|
|Abstract/Description:||This report presents a review of a research effort to evaluate the safety implications of advisory speeds at horizontal curve locations on Oregon rural two-lane highways. The primary goals of this research effort were to characterize driving operations at rural two-lane highway curve locations where advisory speed signs were present, and to determine to what extent these signs play a role in enhancing safety. Placement of advisory speed signs at horizontal curve locations in the State of Oregon is a practice aided by unique and specific state-level policies and, as such, may vary from nationally accepted procedures. Speed data was collected at 16 sites and compliance with advisory speed signs determined. An evaluation of site crash data and how advisory speed relates to historic crash information is included along with a statistical model that identifies critical variables that are associated with the posted speed and how they ultimately relate to the expected crash frequency. The research team developed a statistically based advisory speed model that assesses predicted crash outcomes based on a combination of geometric design, operations, and signage. The resulting advisory speed models were then contrasted to the expected advisory speeds based on the Oregon Policy as well as the 2009 MUTCD thresholds. They determined that the safety-based model actually predicted advisory speeds that are not as conservative as those recommended using the ball-bank thresholds in the 2009 MUTCD or those identified using the thresholds Oregon has been using. Just prior to publication of this report, the Oregon Traffic Control Devices Committee (OTCDC) decided to adopt the 2009 MUTCD without making an exception to advisory speed posting guidelines. ODOT has begun to transition to the 2009 MUTCD advisory speed posting criteria. Actual adoption of the 2009 MUTCD is expected to occur in August 2011.|
|Table of Contents:||Final Report -- Appendices.|
by Karen K. Dixon, Ph.D., Raul Eduardo Avelar, School of Civil and Construction Engineering, Oregon State University ; for Oregon Department of Transportation, Research Section and Federal Highway Administration and Oregon Transportation Research and Education Consortium (OTREC).
Title from PDF title page (viewed on September 28, 2021).
"FHWA-OR-RD 11-14"--Technical report documentation page.
"SPR 685, OTREC RR-11-18."
This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.
Includes bibliographical references (page 85).
Sponsored by Oregon Dept. of Transportation, Research Section; Federal Highway Administration; Oregon Transportation Research and Education Consortium SPR 685 OTREC-RR -11-18
Mode of access: Internet from the Oregon Government Publications Collection.
Text in English.
Speed zoning (Traffic engineering) -- Oregon
Rural roads -- Oregon -- Safety measures
|Restrictions on Access:||http://rightsstatements.org/vocab/CNE/1.0/|