Evaluation of a proposal to set a goal for the Virginia strategic highway safety plan of a forty percent reduction in traffic fatalities and injuries by 2010.

Kweon, Young-Jun · 2006 · ROSA P / Virginia Transportation Research Council (VTRC)

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Summary

This study evaluates the feasibility of a proposed goal in Virginia’s Strategic Highway Safety Plan to reduce traffic fatalities and injuries by 40% by 2010. Motivated by the need to set realistic, achievable targets for state-level safety planning, the research determines whether this aggressive reduction is reasonable or overly optimistic. The study forecasts traffic outcomes under three scenarios: a baseline with no new interventions, a scenario with four specific engineering improvements, and a scenario combining those engineering improvements with the enactment of a primary enforcement seat belt law. The methodology utilizes historical annual traffic crash data from Virginia spanning 1951 to 2004. The researcher employs univariate time-series analysis, specifically using linear trend models with autoregressive errors, autoregressive distributed lag (ARDL) models, and autoregressive integrated moving average (ARIMA) models to project future fatalities and injuries. To address the uncertainty of the final safety plan’s contents, the study incorporates specific countermeasures: adding exclusive left-turn lanes, modifying signal change intervals, installing centerline rumble strips, and upgrading guardrails. The effectiveness of these engineering treatments is quantified using crash modification factors from existing literature. For the legislative scenario, the impact of a primary seat belt law is estimated based on prior studies showing reductions in fatalities and injuries. Forecasts are generated for 2010, and probabilities of achieving the 40% reduction goal are calculated assuming normal distributions of the forecasted values. The results indicate that the 40% reduction goal is overly optimistic. Under the engineering-only scenario, with treatments implemented at a 50% level, the probability of achieving a 40% reduction in fatalities is only 1.2%, and for injuries, it is 0.012%. Even when combining engineering improvements with a primary seat belt law, the probabilities remain low at 8.6% for fatalities and 0.05% for injuries. The baseline forecasts suggest a slight increase or stabilization in crash numbers rather than a significant decline without intervention. Consequently, the study recommends more realistic goals: a 10% reduction (maximum 20%) for fatalities and a 5% reduction (maximum 10%) for injuries by 2010. These recommendations assume the enactment of a primary seat belt law and the implementation of engineering countermeasures at a 20% to 30% level. The significance of this research lies in providing evidence-based guidance for policy makers developing strategic highway safety plans. By demonstrating that ambitious goals like a 40% reduction are statistically improbable given current trends and feasible interventions, the study advocates for setting achievable targets. This approach ensures that safety plans remain credible and focused on practical improvements, such as specific engineering treatments and legislative enforcement, rather than relying on unrealistic expectations. The findings underscore the importance of using rigorous forecasting methods to evaluate the potential impact of safety initiatives before establishing official state goals.

Key finding

The probability of achieving a 40% reduction in traffic fatalities by 2010 is only 8.6% under the most optimistic scenario involving a primary seat belt law and 50% implementation of four engineering treatments.

Methodology

modeling

Provenance

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Topics

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• fatality injury trends
• comparative international
• regulatory evaluation

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Applied Guidance: countermeasure evaluation
• Empirical Findings: crash risk outcomes