Evaluating Design-Build vs. Traditional Contracting Methods for STIP Projects: An Assessment of Travel Impact & Delay Cost
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2004-06-01
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TRIS Online Accession Number:00984940
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Edition:Final Report
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Abstract:Highway construction impacts travel time and causes vehicular delays for road users. Innovative construction techniques like the design build, or fast track method can reduce the time of construction activity when compared to traditional build methods, thus resulting in reduced network delay. The faster the construction activity occurs, the lower the impact on users and the higher the savings in delay cost. This study assesses the travel and cost impacts due to traditional build and fast track techniques for the Utah Department of Transportation's five-year road improvement programs which are a part of the Statewide Transportation Improvement Plan. The build scenarios were modeled from 2004 until 2010 using a macroscopic transportation planning simulation model called VISUM. A partial network algorithm was developed to run traffic assignments on reduced networks that represented the project areas. Five Statewide Transportation Improvement projects were identified and grouped into three analysis areas to analyze the impact comprehensively. The simulation results were quantified in terms of measures of effectiveness viz. vehicle miles of travel, vehicle hours of delay and vehicle hours of delay/vehicle miles of delay (second delay). Finally, the delay was converted into daily delay cost to assess the cost savings and suggest the best contracting technique for the projects.
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