Developing Guidelines for Integrating Safety and Cost-Effectiveness into Resurfacing, Restoration, and Rehabilitation (3R) Projects (2021) / Chapter Skim
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4 Chapter 2. Literature and Current Practice Review This section of the report summarizes the literature review conducted for research including safety effects of geometric design features, traffic operational effects of geometric design features, pavement resurfacing effects, and cost-effectiveness/benefit–cost tools.
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5 FHWA's 10 controlling criteria for geometric design (21) , with the exception of design loading structural capacity, which is not a geometric design element.
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6 Table 2. Summary of Traffic Operational Effects of Key Geometric Design Elements [adapted from (22)
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7 Program (RSRAP) and AASHTOWare Safety Analyst.
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8 RSRAP automatically considers all feasible combinations of lane widening, shoulder widening, and shoulder paving for every project. The other improvement types are considered if and when the user chooses to consider them.
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9 Safety Analyst requires more data than RSRAP, its data requirements are less than those for HSM Part C Safety Analyst includes built-in default SPFs for specific roadway segment and intersection types and can also utilize user-supplied SPFs.
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