MaineDOT 295 I-295 Corridor Update Scarborough to Brunswick June 2018 I-295 Corridor Update Scarborough to Brunswick Prepared by Maine Department of Transportation Bureau of Planning Transportation Analysis June 2018 Table of Contents I-295 ............................................................................................................................................... 1 I. Introduction ............................................................................................................................. 1 Background ...................................................................................................................... 1 Purpose and Need ............................................................................................................ 1 Study Process ................................................................................................................... 3 II. Existing Conditions .............................................................................................................. 4 Transportation Inventory ................................................................................................. 4 1. Segments .......................................................................................................................... 4 2. Interchanges ..................................................................................................................... 5 3. Related Transportation Facilities and Services ................................................................ 9 Traffic Volumes ............................................................................................................. 11 1. Monthly Variation .......................................................................................................... 11 2. Daily Variation ............................................................................................................... 12 3. Design Hour Volumes .................................................................................................... 12 4. Truck Traffic .................................................................................................................. 14 5. Mass Transportation Users ............................................................................................. 14 6. Historical Traffic Growth ............................................................................................... 14 Safety and Mobility Operating Conditions .................................................................... 17 1. Travel Speeds ................................................................................................................. 17 2. Crashes ........................................................................................................................... 19 3. High Crash Locations ..................................................................................................... 20 4. Highway Incidents.......................................................................................................... 20 5. Capacity .......................................................................................................................... 23 6. Level of Service ............................................................................................................. 24 7. Reliability ....................................................................................................................... 25 Environmental Overview ............................................................................................... 27 1. Physical and Biological Environment ............................................................................ 28 2. Land Use, Cultural, Social, and Economic Environment .............................................. 28 3. Atmospheric Environment ............................................................................................. 28 III. Future Conditions............................................................................................................... 29 Forecast .......................................................................................................................... 29 Safety and Mobility Operating Conditions .................................................................... 30 External Factors and Trends .......................................................................................... 35 1. I-95/Maine Turnpike ...................................................................................................... 35 2. Other ............................................................................................................................... 36 IV. Alternatives ........................................................................................................................ 38 Strategies, Actions, and Options .................................................................................... 38 Strategy Assessment ...................................................................................................... 39 1. Auxiliary Lanes .............................................................................................................. 39 2. Intelligent Transportation Systems................................................................................. 44 3. Commuter Transit .......................................................................................................... 53 4. Interchange Improvement .............................................................................................. 54 5. New Highway Capacity ................................................................................................. 57 Candidate Actions .......................................................................................................... 62 1. Auxiliary Lanes .............................................................................................................. 62 2. Intelligent Transportation Systems................................................................................. 64 3. Commuter Transit .......................................................................................................... 66 4. Interchange Improvement .............................................................................................. 66 5. New Highway Capacity ................................................................................................. 70 V. Analysis.............................................................................................................................. 71 Auxiliary Lanes .............................................................................................................. 71 Intelligent Transportation Systems ................................................................................ 77 Commuter Transit .......................................................................................................... 78 Interchange Improvement .............................................................................................. 79 New Highway Capacity ................................................................................................. 79 Effectiveness, Cost, and Challenges .............................................................................. 80 1. Effectiveness .................................................................................................................. 80 2. Cost................................................................................................................................. 82 3. Implementation Challenges ............................................................................................ 83 4. Benefit/Cost .................................................................................................................... 84 VI. Recommendations .............................................................................................................. 85 Near-Term Improvements .............................................................................................. 85 Mid-Term Improvements ............................................................................................... 91 Long-Term Improvements ............................................................................................. 97 Appendices .................................................................................................................................. 101 2016 DHV .................................................................................................................... 101 Percent Heavy Vehicles, Tractor Trailers .................................................................... 101 Percent Heavy Vehicles, Single Unit Trucks ............................................................... 101 Crash Summary I - Northbound ................................................................................... 101 Crash Summary II - Northbound ................................................................................. 101 Crash Summary I - Southbound ................................................................................... 101 Crash Summary II - Southbound ................................................................................. 101 High Crash Location Diagrams - Northbound ............................................................. 101 High Crash Location Diagrams - Southbound ............................................................