Turner-Fairbank Highway Research Center

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Review of the Impacts of the Towaway Reporting Threshold on a Highway Safety Program

Product Type

HSIS Summary Report


Lacy, K., C. Zegeer, and R. Schneider




This study reviewed the potential impacts of a towaway reporting threshold (where at least one vehicle is disabled to the extent it must be towed from the scene) on the North Carolina Highway Safety Improvement Program (HSIP) listings and on the locations and types of crash patterns identified on collision diagrams by field engineers. Results showed that there would be significant shuffling of HSIP listings that North Carolina uses to identify, investigate, and treat potentially hazardous locations on the highway system. The results of the crash-pattern analysis indicate that a towaway crash report threshold would make it more difficult for a group of engineers to identify crash patterns and therefore less likely to recommend improvements to certain sites with serious problems.

Link To HSIS Summary Report

Review of the Impacts of the Towaway Reporting Threshold on a Highway Safety Program


Accident prone locations; Accident reports; Accident types; Impact studies; Safety programs; Towaway reporting threshold

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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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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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