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Turner-Fairbank Highway Research Center

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Safety Evaluation of Lane and Shoulder Width Combinations on Rural, Two-Lane, Undivided Roads

Product Type

Technical Summary






This is a technical summary of the Federal Highway Administration (FHWA) report with the same title, FHWA-HRT-09-031. The safety effectiveness of various lane-shoulder width combinations for a fixed paved width is explored empirically in this study to provide better support to the States when selecting a lane-shoulder combination for a given paved width on rural, two-lane, undivided roads.

Link To Technical Summary

Safety Evaluation of Lane and Shoulder Width Combinations on Rural, Two-Lane, Undivided Roads


lane width
shoulder width
crash modification factor
geometric design

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HSIS Summaries

HSIS Summary Reports are two to eight pages in length and include a brief description of the issue addressed, data used, methodology applied, significant results, and practical implications.

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Research Reports

A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically.

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Technical Summaries

Research reports are often summarized in executive summaries, technical briefs, or other abbreviated formats. Included here are those road safety summaries that involved research using HSIS data.

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Safety Analysis Tools

In addition to conducting research, HSIS resources are also used to develop products that can be used by practitioners in the analysis of safety problems.

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HSIS data are sometimes used in research studies that result in other types of finished products, such as dissertations, theses, and conference proceedings.

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