What does the Cost Effectiveness Index (CEI) represent in crash analysis?

The Cost Effectiveness Index (CEI) in crash analysis specifically represents the ratio of the Present Value Cost to the reduced number of crashes. This metric is crucial because it allows safety analysts and decision-makers to evaluate the financial efficiency of various safety interventions. By quantifying how much cost is incurred per crash reduced, stakeholders can make informed decisions about which safety measures deliver the best outcomes relative to their costs. This approach facilitates prioritization of projects that yield the highest benefits in terms of crash reductions for the investment made, promoting more effective allocation of limited resources to improve road safety.