RRR Design Standards: Cost-Effectiveness Issuesby Robert E. Skinner, Jr., Transportation Research Board, Washington, DC, USA,
Document Type: Proceeding Paper
Part of: Effectiveness of Highway Safety Improvements
The Transportation Research Board study of geometric design standards for RRR projects is currently trying to match the logic of cost-effectiveness to the mostly judgmental process of setting standards. It is doing so in ways that address not only the trade off between improved safety and cost at the level of an individual project but also the tradeoff between safety and pavement condition that effectively takes place at a statewide level. The study is encountering a number of difficult and still unresolved issues affecting the development and interpretation of cost-effectiveness analyses related to standards. These include: Accident relationships needed to estimate the incremental safety gains, Cost relationships are highly variable depending on factors such as terrain, prevalent unit costs, and usual design practices. Early project level cost-effectiveness comparisons.
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