Crash Impact of Smooth Lane Narrowing with Rumble Strips at Two-lane Stop-controlled Intersections
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Published: 2010
Total Pages: 8
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Published: 2010
Total Pages: 8
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Published: 2010
Total Pages: 8
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DOWNLOAD EBOOKAuthor: Xiaoduan Sun
Publisher:
Published: 2019
Total Pages: 203
ISBN-13:
DOWNLOAD EBOOKOver the past several years, Louisiana has installed quite a few relatively new crash countermeasures, such as center line rumble strips (CLRS) on rural two-lane highways, restriping four-lane undivided roadways to three-lane or five-lane roadways with center lane for left turns, restricting median openings on high speed corridors (RCUT), and roundabouts. Evaluating the effectiveness of these crash countermeasures is crucial for the state highway safety improvement programs. According to the results of this study, these four countermeasures are generally cost-effective and successful in reducing crashes, particularly severe crashes. Estimated crash modification factors (CMFs) for total crashes are 0.83 for CLRS by the Empirical Bayes (EB) method. The CMF for the lane conversion to three and five-lane highways are 0.61 and 0.70 by EB method for segment, and 0.69 and 0.76 by Improved Prediction Method for segment plus intersection. The CMF for RCUT is 0.86 and 0.69 by Improved Prediction Method for RCUT section and intersection only. The CMF for RCUT intersection only is 0.80 by EB method. The CMF for roundabout with stop-sign on minor street (without layout change) is 0.32 and 0.28 by Improved Prediction and EB method. Except roundabout, the ratio of benefit to cost (B/C) is bigger or much bigger than one. Being the most expensive countermeasure, the B/C ratio of roundabout is less than one, but that estimation did not count the benefit from the improved traffic flow performance (reduced delay or saving in travel time) and long-time safety benefits (only three after years).
Author: Andrew Vogt
Publisher:
Published: 1999
Total Pages: 184
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DOWNLOAD EBOOKAuthor: Darren J. Torbic
Publisher: Transportation Research Board National Research
Published: 2009
Total Pages: 188
ISBN-13:
DOWNLOAD EBOOKThis report provides guidance for the design and application of shoulder and centerline rumble strips as an effective crash reduction measure, while minimizing adverse effects for motorcyclists, bicyclists, and nearby residents. Using the results of previous studies and the research conducted under this project, safety effectiveness estimates were developed for shoulder rumble strips on rural freeways and rural two-lane roads and for centerline rumble strips on rural and urban two-lane roads.
Author: Xiaoduan Sun
Publisher:
Published: 2021
Total Pages: 105
ISBN-13:
DOWNLOAD EBOOKAuthor: Lee August Rodegerdts
Publisher: Transportation Research Board
Published: 2010
Total Pages: 407
ISBN-13: 0309155118
DOWNLOAD EBOOKTRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
Author: David A. Noyce
Publisher:
Published: 2003
Total Pages: 120
ISBN-13:
DOWNLOAD EBOOKAuthor: Craig Lyon
Publisher:
Published: 2015
Total Pages: 64
ISBN-13:
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