United States Department of Transportation
i
Efficiency Study of Design-Build Program
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2020-12-31
[PDF-10.96 MB]
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Edition:Final Report
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Abstract:This report summarizes a two-year study of the South Carolina Department of Transportation (SCDOT) Design-Build Program. The research examined design-build project selection, cost estimating procedures and overall project performance. The study benchmarked the SCDOT Design-Build Program against other state DOT programs through interviews, past project data collection and case studies. The research team concluded that SCDOT, which has been performing design-build projects for almost 30 years, has one of the more mature programs in the country. SCDOT is following best practices in project selection and working closely with FHWA to standardize the procedures at the national level. The cost estimating methods are providing, on average, accurate project cost estimates with some level of conservatism. Continuing to improve its risk-based cost estimating approach will likely yield more accurate cost estimates. When benchmarked against average project performance in a recent FHWA national study and internal SCDOT design-bid-build projects, the research team found that the SCDOT projects outperformed these projects in all estimating, cost and schedule metrics except for schedule growth after contract award. As demonstrated through its leadership in a recent FHWA Design-Build Peer Exchange, the SCDOT Design-Build Program is a national leader. Its commitment to continuous improvement bodes well to maintain this national design-build leadership role.
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