The Harvest Club 255 Elm Street Somerville, Massachusetts Transportation Impact Study Prepared For: The Harvest Club Prepared by: Design Consultants, Inc. January 2021 255 ELM STREET TABLE OF CONTENTS 1. EXECUTIVE SUMMARY ......................................................................................................... 5 1.1 Introduction ................................................................................................................. 5 1.2 Study Area .................................................................................................................. 5 1.3 Safety Analysis ............................................................................................................ 5 1.4 Trip Generation ........................................................................................................... 5 1.5 Intersection Capacity Analysis .................................................................................... 6 1.6 Conclusion .................................................................................................................. 6 2. EXISTING CONDITIONS INVENTORY ................................................................................. 11 2.1 Study Area ................................................................................................................ 11 2.1.1 Study Roadways ................................................................................................. 11 2.1.2 Study Intersections .............................................................................................. 17 2.1.3 Transit and Land Use Figures ............................................................................. 21 2.2 Existing Conditions Data Collection .......................................................................... 25 2.2.1 Automatic Traffic Recorder (ATR) Counts ........................................................... 25 2.2.2 Pedestrian and Bicycle Counts ........................................................................... 25 2.2.3 Intersection Turning Movement Counts (TMCs) and Queues ............................. 25 2.2.4 Traffic Crashes .................................................................................................... 36 2.2.5 Public Transit....................................................................................................... 38 2.2.6 Parking ................................................................................................................ 40 2.2.7 Traffic Signal Timing Information ......................................................................... 40 2.3 Existing Conditions Transportation Analysis ............................................................. 40 2.3.1 Vehicle Analysis .................................................................................................. 41 2.3.2 Bicycle Analysis................................................................................................... 42 2.3.3 Pedestrian/ADA Analysis .................................................................................... 47 2.3.4 Transit Analysis ................................................................................................... 59 3. FUTURE TRANSPORTATION ANALYSIS ........................................................................... 64 3.1 Build Conditions ........................................................................................................ 64 3.1.1 Project Traffic ...................................................................................................... 64 3.1.2 Project Trip Distribution ....................................................................................... 66 3.1.3 2020 Build Conditions Vehicle Analysis .............................................................. 73 3.1.4 2020 Build Conditions Pedestrian and Bicycle Analysis ..................................... 73 3.2 2025 Design Year Build Conditions .......................................................................... 75 3.2.1 Background Development Projects ..................................................................... 75 3.2.2 Background Growth Rate .................................................................................... 75 3.2.3 2025 Design Year Build Conditions Vehicle Analysis ......................................... 79 3.3 Future Parking Analysis ............................................................................................ 79 3.4 Future Transit Analysis ............................................................................................. 79 4. TRANSPORTATION DEMAND MANAGEMENT .................................................................. 81 4.1 TDM Measures .......................................................................................................... 81 5. CONCLUSION ....................................................................................................................... 83 LIST OF FIGURES Figure 1.2.1: Study Intersections .................................................................................................................. 8 Figure 1.2.2: Locus Map .............................................................................................................................. 9 Figure 2.1.1: Existing Transit Services ...................................................................................................... 22 Figure 2.1.2: Existing Land Uses ............................................................................................................... 23 2 255 Elm Street 255 ELM STREET Figure 2.2.1: 2020 Existing Peak Hour Pedestrian Volumes ..................................................................... 26 Figure 2.2.2: 2020 Existing Saturday Midday Peak Hour Pedestrian Volumes ........................................ 27 Figure 2.2.3: 2020 Existing Peak Hour Bicycle Volumes .......................................................................... 28 Figure 2.2.4: 2020 Existing Saturday Midday Peak Hour Bicycle Volumes .............................................. 29 Figure 2.2.5: 2020 Existing Traffic Volumes – Weekday AM Peak Hour .................................................. 30 Figure 2.2.6: 2020 Existing Traffic Volumes – Weekday PM Peak Hour .................................................. 31 Figure 2.2.7: 2020 Existing Traffic Volumes – Saturday Midday Peak Hour ............................................ 32 Figure 2.2.8: 2020 Existing Traffic Volumes – Weekday AM Peak Period ................................................ 33 Figure 2.2.9: 2020 Existing Traffic Volumes – Weekday PM Peak Period ................................................ 34 Figure 2.2.10: 2020 Existing Traffic Volumes – Saturday Midday Peak Period ....................................... 35 Figure 2.3.1: Bicycle Level of Traffic Stress Summary .............................................................................. 46 Figure 2.3.2: Pedestrian Level of Traffic Stress Summary ......................................................................... 58 Figure 3.1.1: Project Trip Distribution ...................................................................................................... 68 Figure 3.1.2: Site-Generated Vehicle-Trips ............................................................................................... 69 Figure 3.1.3: 2020 Build Conditions Traffic Volumes – Weekday AM Peak Hour .................................... 70 Figure 3.1.4: 2020 Build Conditions Traffic Volumes – Weekday PM Peak Hour .................................... 71 Figure 3.1.5: 2020 Build Conditions Traffic Volumes – Saturday Midday Peak Hour .............................. 72 Figure 3.2.1: 2025 Design Year Build Traffic Volumes – Weekday AM Peak Hour .................................. 76 Figure 3.2.2: 2025 Design Year Build Traffic Volumes – Weekday PM Peak Hour .................................. 77 Figure 3.2.3: 2025 Design Year Build Traffic Volumes – Saturday Midday Peak Hour ........................... 78 LIST OF TABLES Table 1.5-1: Level-of-Service Summary ........................................................................................................ 6 Table 2.2-1: MassDOT Intersection Crash Summary ................................................................................. 37 Table 2.3-1: Intersection LOS Thresholds .................................................................................................. 40 Table 2.3-2: 2020 Existing Conditions Level of Service ............................................................................. 41 Table 2.3-3: Pedestrian Level of Traffic Stress – Elm Street ...................................................................... 47 Table 2.3-4: Pedestrian Level of Traffic Stress – Grove Street .................................................................. 48 Table 2.3-5: Pedestrian Level of Traffic Stress – Bowers Avenue .............................................................. 48 Table 2.3-6: Pedestrian Level of Traffic Stress – Highland Avenue ........................................................... 49 Table 2.3-12: Pedestrian Timings and Delay ............................................................................................. 57 Table 2.3-13: Transit Analysis Summary - Inbound ................................................................................... 59 Table 2.3-14: Transit Analysis Summary - Outbound ...............................................................................