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Project Details

Title:Safety Support System for Highway-Rail Grade Crossing
Principal Investigators:Pan Lu and Denver Tolliver
University:North Dakota State University
Status:Active
Year:2017
Project #:MPC-550
RiP #:01653378
Keywords:crash rates, crash severity, decision making, grade crossing protection systems, railroad crashes, railroad grade crossings, railroad tracks, ranking (statistics), resource allocation
 

Abstract

This research is to develop a safety support system for improvement-resource allocation decision making. There are several critical components. Defining safety performance index is essential, therefore, forecasting models or priority ranking techniques can be utilized to rank the crossings that are not only the "hazard" crossings but also can benefit the most from improvements. A systematic method for identifying and ranking crossings for safety or operational improvement is necessary for an explicit decision making process to improve HRGC. The most common approaches to identify the crossings for safety improvement is the hazard index technique. A hazard index is utilized to calculate a value that ranks crossing in relative terms with a higher index associated with a more hazardous crossing while evaluating mainly on fixed effects of traffic exposure factors, travel speed factors, and accident history. Few existing formula also looked at train tracks and lane count factor. Protection factors. None of the existing formulae takes into consideration of both crash frequency estimates and the severity of crashes. Moreover, the existing hazard index approach could not truly identify the most dangerous crossing with limited site indicator factors and could not identify the crossings, which will benefit the most from available improvement activities. In other words, few research aggregate frequency and severity forecasts to estimate crossing hazard. Even with the aggregated hazard measure, hazard alone cannot help decision maker to allocate resources effectively and efficiently. To understand how effective each engineering countermeasure to improve safety performance and reduce hazard at grade crossings is very critical for safety improvement decision-making. Therefore, analyze the potential effectiveness of crossing devices treatments based on specific attributes of each crossing is another critical research focus of the study.

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