Other Publication
Davis, G., H. Xiong, and H. Tao
Jan-09
This paper describes a Bayesian statistical technique for using crash records to estimate the frequency and rate of median-crossing crashes (MCC) on each set of highway sections, when MCCs are not explicitly identified in computerized crash records. The technique requires an analyst to review only a subset of hard-copy accident reports to produce a training sample, which is then used to identify computerized data associated (possibly imperfectly) with whether or not a crash was an MCC. This association can then be exploited to use larger sets of computerized records to increase statistical power over that provided by the training sample alone. This technique was applied to data from Minnesotas freeways and rural expressways. Estimates which allowed highway sections to be ranked with respect to estimated frequency of MCCs, estimated density of MCCs, or estimated MCC rate were computed, and rankings with respect to estimated frequency are reported. .
Application of Bayesian Statistics to Identify Highway Sections with Atypically High Rates of Median
(search on Paper #09-2595)
median-crossing crashes
hierarchical Bayes
high-hazard locations
Markov Chain Monte Carlo
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.
A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically.
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.
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.
HSIS data are sometimes used in research studies that result in other types of finished products, such as dissertations, theses, and conference proceedings.
