Highway Safety Decision Support Tool for Project Prioritization
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Solution Overview
Problem
Highway agencies face challenges in selecting the most effective highway improvement projects due to limited resources and the need for objective decision-making, particularly in prioritizing safety improvements based on quantitative safety evaluations.
Innovation Solution
A decision support tool utilizing a computing device to analyze crash data, determine crash frequencies and costs, and calculate benefit-cost ratios for countermeasures across different emphasis areas, providing a user interface for visualizing and selecting cost-effective safety improvements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If highway agencies implement multiple safety improvement projects, then safety performance improves, but resource consumption increases
Solution Approach 1:
The system changes the parameter of project selection from qualitative judgment to quantitative analysis by calculating benefit-cost ratios based on crash frequency reduction estimates, implementation costs, and safety performance metrics. This allows agencies to objectively prioritize projects that deliver the highest safety improvement per unit of resource consumed.
Solution Approach 2:
The system applies different analysis methods to different project types and locations by categorizing projects into emphasis areas and functional classes, then tailoring the benefit-cost analysis to specific crash types, roadway characteristics, and countermeasure effectiveness data appropriate to each local context.
2Measurement precision
If highway agencies conduct comprehensive safety evaluations, then project selection accuracy improves, but analysis time increases
Solution Approach 1:
The system performs preliminary actions by pre-calculating crash frequencies, identifying emphasis areas, and estimating countermeasure effectiveness before the actual project selection process. This preliminary analysis of historical crash data and roadway characteristics enables faster, more accurate project selection without requiring time-consuming evaluations during the decision-making phase.
Solution Approach 2:
The system introduces an intermediary computational layer that processes comprehensive safety data through automated algorithms and mathematical models. This intermediary layer translates raw crash data and project specifications into standardized benefit-cost ratios, eliminating the need for manual comprehensive evaluations while maintaining high measurement precision.
3Reliability
If highway agencies use objective matrices for project selection, then decision-making quality improves, but system complexity increases
Solution Approach 1:
The system achieves universality by creating a multi-functional benefit-cost analysis framework that handles diverse project types, crash categories, and countermeasure types through a single integrated methodology. The same core algorithm calculates benefit-cost ratios whether the project involves roadway geometry changes, safety features, or other interventions, simplifying the system while maintaining objective decision-making quality across all project types.
Data Source
AI summary
A method analyzing benefits and cost for a roadway improvement project includes obtaining definitions of a plurality of emphasis areas associated with a highway safety plan, and obtaining crash data associated with each of the plurality of emphasis areas. The crash data can include a plurality of crashes, a location of each crash, functional class associated with each crash, and injury levels associated with each crash. The method further includes obtaining countermeasure and Crash Modification Factor (CMF) data associated with each emphasis area, obtaining spatial assignments for each crash, determining a frequency of crashes for at least one injury level for each emphasis area, determining a plurality of costs associated with each countermeasure in the countermeasure and CMF data, a benefit cost ratio for each countermeasure in the countermeasure and CMF data associated with the emphasis area, and generating a first user interface configured to render a table or a visualization based at least on at least one emphasis area, the set of countermeasures, and the benefit cost ratio associated with the at least one countermeasure.