Impact of Shoulder Width and Median Width on Safety (2009) / Chapter Skim
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Pages 27-31
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From page 27... ...
Finally, the AMFs developed for the presence of paved right shoulders and left-turn lanes produced counterintuitive results, and the research team concluded that neither AMF should be included as a design element with a guideline. Average Shoulder Width Recommendation The research team reviewed past literature, the recommended values for the HSM, and the AMFs from NCHRP Project 15-27 and agreed that there is an influence on crash occurrence from the presence of shoulders.
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From page 28... ...
The AMFs for each condition obtained from the models developed in this research are summarized in Table 17. 28 Name and Agency Expertise Ken Agent, University of Kentucky Safety engineer Dominique Lord, Texas Transportation Institute Highway safety analyst Jerry Pigman, University of Kentucky Safety engineer Wendel Ruff, ABMB Engineers, Inc.
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From page 29... ...
AMFs based on prediction models for average shoulder width. Median width (ft)
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From page 30... ...
Median Barrier Recommendation The research team reviewed past literature, the recommended values in the HSM, and the AMFs from NCHRP Project 15-27 and agreed that there is an influence on crash occurrence from the presence of median barrier. However, the values obtained from this research are based on a small sample (200 segments, less than 5% of the data)
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From page 31... ...
AMFs for median barrier presence, divided roadways. ent values for a single or combination of design elements.
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