Interchange Justification Study I-29 at Benson Road Sioux Falls, South Dakota May 2001 Prepared for: South Dakota Department of Transportation Office of Transportation Planning & Programs 700 East Broadway Avenue Pierre, South Dakota 57501-2586 Prepared by: Kirkham Michael Consulting Engineers 9110 West Dodge Road P.O. Box 24129 Omaha, NE 68124-0129 Benson Road Interchange Justification Study Table of Contents Introduction..................................................................................................................................... 1 Purpose ........................................................................................................................................ 1 Project Location........................................................................................................................... 1 Project Development ................................................................................................................... 1 Study Area ................................................................................................................................... 1 Existing Conditions......................................................................................................................... 3 Existing Roadway System........................................................................................................... 3 Interstate and Traffic Interchanges.............................................................................................. 6 Interstate 29.............................................................................................................................. 6 12th Street Traffic Interchange (Exit 79) .................................................................................. 6 Maple/Russell Street Traffic Interchange (Exit 81)................................................................. 6 SD-38 Traffic Interchange (Exit 83) ........................................................................................ 7 Traffic Volumes........................................................................................................................... 7 Traffic Operations Analysis ........................................................................................................ 7 Area Intersections..................................................................................................................... 9 Traffic Interchanges ................................................................................................................. 9 Freeway Segments.................................................................................................................... 9 Merge/Diverge Analysis ..........................................................................................................9 Accident History........................................................................................................................ 12 Proposed Land Uses .................................................................................................................. 13 Proposed Roadway Network ..................................................................................................... 13 Traffic Projections ..................................................................................................................... 15 Historical Traffic Counts........................................................................................................ 16 Sioux Falls Growth Management Plan .................................................................................. 16 Alternative Concepts ................................................................................................................. 21 Single Point Urban Interchange ............................................................................................. 21 Diamond Interchange ............................................................................................................. 22 Partial Cloverleaf Interchange................................................................................................ 22 Frontage Roads....................................................................................................................... 22 High Occupancy Vehicles (HOV) Lanes............................................................................... 23 Other T.S.M. and T.D.M. Alternatives .................................................................................. 23 I.T.S. Alternatives .................................................................................................................. 23 Alternative Selection.............................................................................................................. 23 Interchange Design Criteria....................................................................................................... 24 Future Traffic Operations .......................................................................................................... 24 2025 No-Build........................................................................................................................ 26 2025 w/Benson TI .................................................................................................................. 26 2025 w/Madison & Benson TI’s ............................................................................................ 30 Environmental Impacts.............................................................................................................. 32 Summary....................................................................................................................................... 34 FHWA Criteria .......................................................................................................................... 34 Purpose and Need................................................................................................................... 34 Relationship to other Highway Improvement Plans .............................................................. 35 Distance to and Sizes of Communities Served....................................................................... 35 Kirkham Michael Benson Road Interchange Justification Study Description of Existing and Proposed Access ....................................................................... 35 Proposed Local Street Network ............................................................................................. 36 Traffic and Operational Analysis ........................................................................................... 36 Brief Environmental Analysis................................................................................................ 37 Additional Information........................................................................................................... 37 List of Figures Figure 1-Vicinity Map .................................................................................................................... 2 Figure 2-Existing Lane Geometry .................................................................................................. 4 Figure 3-Existing PM Peak Hour Traffic Volumes ........................................................................ 8 Figure 4-2025 Roadway Network................................................................................................. 14 Figure 5-2025 No-Build Peak Hour Traffic Volumes .................................................................. 18 Figure 6-2025 w/Benson Peak Hour Traffic Volumes ................................................................. 19 Figure 7-2025 w/Madison & Benson Peak Hour Traffic Volumes .............................................. 20 Figure 8-Benson Road Interchange Functional Design................................................................ 25 Figure 9-2025 No-Build PM Peak Hour Intersection LOS .......................................................... 27 Figure 10-2025 No-Build LOS Analysis ...................................................................................... 28 Figure 11-2025 w/Benson TI LOS Analysis ................................................................................ 31 Figure 12-2025 w/Madison & Benson TI’s LOS Analysis .......................................................... 33 List of Tables Table 1-Signalized Intersection LOS Criteria ................................................................................ 7 Table 2-Freeway Segment and Ramp LOS Criteria ....................................................................... 9 Table 3-Existing PM Traffic LOS Analysis ................................................................................. 10 Table 4-Existing PM Traffic Ramp Analysis ............................................................................... 11 Table 5-Interchange Accident History.......................................................................................... 12 Table 6-Anticipated Year 2025 Development along I-29 ............................................................ 13 Table 7-Proposed Roadway Improvements.................................................................................. 15 Table 8-Design Standards............................................................................................................. 24 Table 9-Intersection Delay Comparison (w/ Benson Road Interchange)....................................