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US 70, Safford to New Mexico State Line | Interstate Detour Needs Study

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US 70, Safford to New Mexico State Line | Interstate Detour Needs Study U.S. 70, Safford to New Mexico State Line Interstate Detour Needs Study Final Report December 2019 ADOT Contract # 17-171965 Task # MPD 00018-19 Prepared for: Prepared by: U.S. 70 Final Report TABLE OF CONTENTS 1.0 STUDY PURPOSE AND NEED ............................................................................................... 1 1.1 Introduction ........................................................................................................................ 1 1.2 Corridor Overview ............................................................................................................... 5 Location............................................................................................................................... 5 History: “The Old West Highway” ....................................................................................... 5 U.S. 70 Segment Description .............................................................................................. 5 1.3 I-10 Detour and Regional Impact ........................................................................................ 8 1.4 Detour Alternatives ............................................................................................................. 9 2.0 OVERVIEW OF APPROACH AND FINDINGS ............................................................................ 12 2.1 Data Sources ..................................................................................................................... 12 Summary of Previous Studies ........................................................................................... 12 GIS Mapping: Pavement, Bridge, Mobility, Safety, Freight Data ...................................... 12 Field Review ...................................................................................................................... 13 2.2 Key Stakeholder and Study Team Findings ....................................................................... 13 Summary of Corridor Performance Analysis .................................................................... 13 Inter-Agency Communications Protocols ......................................................................... 22 Summary of Agencies Interviewed ................................................................................... 25 2.3 Infrastructure Project Prioritization Approach ................................................................. 28 Application of P2P Process ............................................................................................... 28 Investment Categories ...................................................................................................... 28 Evaluation Criteria for Capital Improvement Project Categorization and Compatibility . 29 3.0 SUMMARY OF RECOMMENDED IMPROVEMENTS .................................................................... 35 3.1 Mobility Solutions ............................................................................................................. 38 3.2 Safety Solutions ................................................................................................................ 42 3.3 Pavement Solutions .......................................................................................................... 46 3.4 Bridge and RCB Culvert Solutions ..................................................................................... 48 3.5 Alternative Detour Corridors for Consideration ............................................................... 51 4.0 CONCLUSION AND IMPLEMENTATION .................................................................................. 52 i | December 2019 U.S. 70 Final Report LIST OF FIGURES Figure 1: ADOT Performance-Based Planning Process ................................................................................. 1 Figure 2: U.S. 70 Study P2P Process .............................................................................................................. 2 Figure 3: Summary of Corridor Issues (Non-Closure Conditions) ................................................................. 3 Figure 4: Summary of Corridor Issues (I-10 Closure Conditions) .................................................................. 4 Figure 5: Town of Duncan, AZ ....................................................................................................................... 5 Figure 6: New Mexico State Line Welcome Sign ........................................................................................... 5 Figure 7: Study Area and Segments .............................................................................................................. 7 Figure 8: I-10 Detour Alternatives .............................................................................................................. 11 Figure 9: Key Reports .................................................................................................................................. 12 Figure 10: Non-Detour Conditions, and Access Point Density East of Safford ........................................... 13 Figure 11: Summary of Mobility Performance During Normal Conditions and Detour Events .................. 15 Figure 12: Limited Sight Distance ................................................................................................................ 16 Figure 13: Steep Embankment with ............................................................................................................ 16 Figure 14: Safety Pull-Out Area ................................................................................................................... 16 Figure 15: Rock Cuts Adjacent to Edge of Pavement .................................................................................. 16 Figure 16: Summary of Crashes by Severity and Type ................................................................................ 17 Figure 17: Summary of Pavement Performance ......................................................................................... 19 Figure 18: Shoat Tank Wash Bridge WB ...................................................................................................... 20 Figure 19: Slick Rock Wash Bridge #2 ......................................................................................................... 20 Figure 20: Summary of Bridge and RCB Culvert Performance .................................................................... 21 Figure 21: Proposed I-10 Closure Communication Protocol ....................................................................... 24 Figure 22: Proposed I-10 Reopening Communication Protocol ................................................................. 24 Figure 23: Summary of Projects .................................................................................................................. 35 Figure 24: Location of Recommended Solutions by Investment Category ................................................. 37 Figure 25: Intersection of U.S. 70 and SR 75 ............................................................................................... 38 Figure 26: DMS ............................................................................................................................................ 40 Figure 27: Sample Route Detour Signs........................................................................................................ 40 Figure 28: Mobility Solutions ...................................................................................................................... 41 Figure 29: Centerline Rumble Strips ........................................................................................................... 43 Figure 30: Rock Cuts/Slope Laybacks .......................................................................................................... 43 ii | December 2019 U.S. 70 Final Report Figure 31: Unpaved Pullout ........................................................................................................................ 44 Figure 32: Proposed Cantilevered Railroad Crossing .................................................................................. 44 Figure 33: Safety Solutions.......................................................................................................................... 45 Figure 34: Pavement Solutions ................................................................................................................... 47 Figure 35: Bridge and RCB Culvert Solutions .............................................................................................. 50 Figure 36: Recommended Solutions by Investment Category and Timeline .............................................. 53 iii | December 2019 U.S. 70 Final Report LIST OF TABLES Table 1: Identified Issues (non-closure & closure conditions) ...................................................................... 2 Table 2: Corridor Segment Descriptions ....................................................................................................... 6 Table 3: I-10 Detour Alternatives Qualitative Evaluation Matrix ................................................................ 10 Table 4: I-10 DMS Locations ........................................................................................................................ 14 Table 5: Pavement Conditions by Segment ...............................................................................................
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