Final Report March 2014 Final Report This document was prepared by Atkins for the Tennessee Department of Transportation Project No. 99108-1154-04 Final Report I-24 Multimodal Corridor Study March 2014 Page i Table of Contents 1.0 Introduction ............................................................................................................... 1 1.1 Corridor Location and Overview .............................................................................. 1 1.2 Purpose of This Document in the Study Process ...................................................... 1 1.3 Project and Strategy Development Process ............................................................. 2 1.3.1 Safety and Congestion Considerations ................................................................... 2 1.3.2 Public Input ............................................................................................................. 3 1.3.3 Technical Analysis Tools .......................................................................................... 4 1.3.4 Evaluation Process .................................................................................................. 4 2.0 Existing Plus Committed and Currently Planned Transportation Projects Evaluation .... 6 2.1 Existing Plus Committed Projects ............................................................................ 8 2.1.1 Subarea Operating Conditions .............................................................................. 10 2.1.2 I-24 Level-of-Service .............................................................................................. 13 2.2 Currently Planned LRTP Projects ........................................................................... 15 2.2.1 LRTP Capacity Projects On I-24 ............................................................................. 15 2.2.2 LRTP Capacity Projects Off I-24 ............................................................................. 20 2.2.3 LRTP Interchange Projects .................................................................................... 25 3.0 Proposed Capacity and Operational Projects and Strategies Evaluation ..................... 28 3.1 Proposed Capacity Projects Evaluation .................................................................. 28 3.1.1 Proposed Capacity Projects On I-24 Evaluation .................................................... 30 3.1.2 Proposed Capacity Projects Off I-24 Evaluation ................................................... 35 3.2 Proposed Operational Projects and Strategies Evaluation ..................................... 40 3.2.1 Proposed New Interstate Access ........................................................................... 40 3.2.2 Proposed Interchange Modifications .................................................................... 42 3.2.3 Proposed Ramp Improvements ............................................................................. 44 3.2.4 Proposed ITS Improvements ................................................................................. 47 3.2.5 Proposed Transit & Park-and-Ride Lot Facilities Strategies .................................. 53 3.2.6 Proposed Managed Lanes Strategies .................................................................... 60 3.2.7 Proposed Truck Lanes ........................................................................................... 63 3.2.8 Proposed Bridge Improvements ............................................................................ 65 3.2.9 Proposed Rock Fall/Slide Mitigation Improvements ............................................. 68 3.2.10 Proposed Miscellaneous Improvements ............................................................... 70 4.0 Freight Diversion ...................................................................................................... 73 4.1 Introduction ......................................................................................................... 73 4.1.1 Freight Diversion Overview ................................................................................... 74 4.1.2 Commodity Flow Database ................................................................................... 76 4.1.3 Mode Shares ......................................................................................................... 78 4.2 Commodity Flows ................................................................................................. 79 Final Report I-24 Multimodal Corridor Study March 2014 Page ii 4.2.1 Geography ............................................................................................................. 79 4.2.2 Commodity Classification ...................................................................................... 82 4.2.3 Freight Movement by Commodity Group ............................................................. 84 4.2.4 Freight Movements by Mode ................................................................................ 85 4.2.5 Freight Shipments by O-D Orientation .................................................................. 86 4.3 Demographics ...................................................................................................... 91 4.3.1 Population ............................................................................................................. 91 4.3.2 Total Employment ................................................................................................. 92 4.4 Freight System ...................................................................................................... 92 4.4.1 Existing Freight Assets .......................................................................................... 92 4.4.2 Planned Improvements ......................................................................................... 94 4.5 Diversion Analysis................................................................................................. 96 4.5.1 Future Freight Demand and Projected Mode Splits .............................................. 96 4.5.2 Diversion by Commodity Group Types .................................................................. 96 4.5.3 Shipping Distance .................................................................................................. 97 4.5.4 Demographics ....................................................................................................... 99 4.5.5 Freight Assets ...................................................................................................... 100 4.5.6 Potential Impacts on I-24 Operating Conditions ................................................. 102 4.5.7 Model Scenarios .................................................................................................. 103 4.5.8 Model Findings .................................................................................................... 105 5.0 Project Screening ................................................................................................... 109 5.1 Capacity Projects On I-24 .................................................................................... 109 5.1.1 Estimated Costs ................................................................................................... 109 5.1.2 Environmental Screening .................................................................................... 112 5.1.3 Economic Impact Screening ................................................................................ 115 5.1.4 Benefit-Cost Screening ........................................................................................ 119 5.1.5 Conclusions .......................................................................................................... 123 5.2 Capacity Projects Off I-24 .................................................................................... 123 5.2.1 Estimated Costs ................................................................................................... 123 5.2.2 Environmental Screening .................................................................................... 126 5.2.3 Economic Impact Screening ................................................................................ 126 5.2.4 Benefit-Cost Screening ........................................................................................ 126 5.2.5 Conclusions .......................................................................................................... 129 5.3 Operational Projects ........................................................................................... 130 5.3.1 Estimated Costs ................................................................................................... 130 5.3.2 Environmental Screening .................................................................................... 137 5.3.3 Economic Impact Screening ................................................................................ 142 5.3.4 Benefit-Cost Screening ........................................................................................ 142 5.3.5 Conclusions .......................................................................................................... 144 6.0 Recommendations and Prioritization of Projects and Strategies .............................. 146 Final Report I-24 Multimodal Corridor Study March 2014 Page iii 6.1.1 Capacity Projects On I-24 .................................................................................... 149 6.1.2 Capacity Projects