Turner-Fairbank Highway Research Center

 
 
 
 
« back to the list

Effects of a Towaway Reporting Threshold on Crash Analysis Results

Product Type

Journal Article

Author

Charles V. Zegeer, Herman F. Huang, J. Richard Stewart, Ron Pfefer and Jun Wang

Date

Sep-98

Full citation

Charles V. Zegeer, Herman F. Huang, J. Richard Stewart, Ron Pfefer, and Jun Wang. Effects of a Towaway Reporting Threshold on Crash Analysis Results, Transportation Research Record 1635, TRB, National Research Council, Washington D.C., 1998

Abstract

The effects on future data analysis capabilities and results should states convert to a towaway and above crash-reporting threshold are quantified. The results from the four states used in the analysis (Illinois, Michigan, Minnesota, and North Carolina) revealed that only 51.7 percent of the crash data would be included using a towaway threshold. Only 33.7 percent would be included using an injury threshold. In general, a towaway threshold would exclude more crashes on urban street than on rural roads. For most road classes, 40 to 60 percent of crashes would be excluded. A towaway threshold would result in greatly underestimating the occurrence of certain crash types, particularly rear-end, sideswipe, parking, and animal crashes. Run-off-road and angle/turning crashes would also be affected considerably. Using a towaway criterion will seriously affect researchers' ability to conduct meaningful evaluations of roadside appurtenances, such as guardrail, breakaway signs and poles, crash cushions, and various median treatments. For most vehicle types, only 30 to 60 percent of crashes would be included under a towaway threshold. Technological, institutional, and organizational strategies for improving crash-reporting thresholds are suggested.

Available From

Transportation Research Record 1635

Link To Journal Article

Link not available.

Keywords

Towaway
Reporting Threshold
Crash Analysis
HSIS


« Back to the List

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.

Read More

Research Reports

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

Read More

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.

Read More

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.

Read More

Other Projects

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

Read More