Case study | Transportation Engineering
18-1082.01 I-65 Added Travel Lanes
Indiana Department of Transportation
American Structurepoint, Inc.
Estimated Completion 2023
As part of the Indiana Department of Transportation (INDOT) 4R Road Reconstruction Plans for I-65 Added Travel Lanes (ATL) project in Boone County, Indiana, Kaskaskia Engineering Group, LLC (KEG), a subconsultant to ASI, completed various tasks including Median Barrier Analysis, Roadside Barrier Design, 8 Small Structure Replacements, Erosion and Sediment Control Plans and the Rule 5/SWPPP Permit Applications. The purpose of the 5.7-mile reconstruction project is to improve the pavement structure, drainage, and capacity of the freeway through pavement reconstruction n, structure replacement, and widening of the roadway. The project limits extend from 0.8 miles north of the I-65/SR 32 interchange to 0.6 miles north of SR 47, along which a cable median barrier was originally installed for the majority of the roadway length.
To identify a compliant and preferred median barrier system to incorporate into the project, KEG conducted the LCCA to provide a cost account of each alternative over its expected life. Information and data were collected pertaining to implementation costs, design warrants, crash history, Crash Modification Factors (CMFs), repair costs, interest rates, traffic forecasts, and other quantitative and qualitative components for the development of and input into the analysis. Ultimately, a Concrete Median Barrier was found to have the lowest total cost and highest benefit-cost ratio for a life cycle of 25 years.
KEG provided the engineering design for all the roadside barrier designs including MGS W-Beam Guardrail along the outside shoulder, Cable Barrier System, and Median Barrier transitions in the median. KEG also developed the details and design layout for 8 small structure replacements throughout the corridor. This included pumping around and permitting specific exhibits for each structure. The small structures each had a unique backfill design detail due to the four-foot thick experimental pavement structure.
Lastly, KEG was responsible for the development, coordination, and submittal of the IDEM Rule 5/SWPPP Application and Permit. This included the design of erosion and sediment control plans to be included in the plans and permit. The design incorporated a new stormwater design including detention ponds doubling as temporary sediment basins with unique seeding patterns to meet 401/404 permit requests.
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Maggie & LeoMatt Masterson
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Greta & TilleyMatt Masterson
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