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Lynnwood Link Extension Final Environmental Impact Statement

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Lynnwood Link Extension Final Environmental Impact Statement LYNNWOOD LINK EXTENSION FINAL ENVIRONMENTAL IMPACT STATEMENT Transportation Technical Report APRIL 2015 Technical Report Transportation 401 South Jackson Street Seattle, WA98104-2826 April 2015 Lynnwood Link Extension | Final Environmental Impact Statement Table of Contents 1 Introduction ................................................................................................................................... 1-1 1.1 Project Background ................................................................................................................................... 1-1 1.2 Purpose of Technical Report ................................................................................................................... 1-3 1.3 Organization of Technical Report .......................................................................................................... 1-3 2 Methodology and Assumptions .................................................................................................... 2-1 3 Relevant Plans, Policies, and coordination .................................................................................. 3-1 3.1 Guiding Regulations, Plans, and/or Policies ........................................................................................ 3-1 3.2 Agency Coordination ................................................................................................................................ 3-2 3.2.1 NEPA Lead Agency ................................................................................................................... 3-2 3.2.2 Cooperating and Participating Agencies .................................................................................3-2 4 Affected Environment .................................................................................................................. 4-1 4.1 Regional Context and Travel Patterns ................................................................................................... 4-1 4.1.1 Transportation Facilities ............................................................................................................ 4-1 4.1.2 Travel Demand and Patterns .................................................................................................... 4-5 4.2 Transit ....................................................................................................................................................... 4-23 4.2.1 Transit Operations and Level of Service ............................................................................. 4-23 4.2.2 Regional Transit ....................................................................................................................... 4-27 4.2.3 Local and Sub-Regional Transit ............................................................................................... 4-9 4.3 Freeway Operations ................................................................................................................................ 4-12 4.3.1 Evaluation Methodology ........................................................................................................ 4-12 4.3.2 Freeway Volumes .................................................................................................................... 4-15 4.3.3 Freeway Speeds and Level of Service ................................................................................... 4-19 4.4 Arterials and Local Streets ..................................................................................................................... 4-23 4.4.1 Traffic Operations ................................................................................................................... 4-23 4.4.2 Property Access and Local Circulation ................................................................................ 4-37 4.5 Nonmotorized Facilities ......................................................................................................................... 4-44 4.5.1 Pedestrian Facilities ................................................................................................................. 4-44 4.5.2 Bicycle Facilities ....................................................................................................................... 4-56 4.6 Freight Mobility and Access .................................................................................................................. 4-67 4.6.1 Key Freight Roadways ............................................................................................................ 4-67 4.7 Parking ...................................................................................................................................................... 4-72 4.7.1 Segment A: Seattle to Shoreline ........................................................................................... 4-73 4.7.2 Segment B: Shoreline to Mountlake Terrace ..................................................................... 4-77 Transportation Technical Report i April 2015 Lynnwood Link Extension | Final Environmental Impact Statement 4.7.3 Segment C: Mountlake Terrace to Lynnwood................................................................... 4-79 4.8 Safety ......................................................................................................................................................... 4-81 4.8.1 I-5 Ramps and Ramp Terminals ........................................................................................... 4-82 4.8.2 Local Intersections .................................................................................................................. 4-84 5 Long-Term Impacts ..................................................................................................................... 5-1 5.1 Regional Context and Travel Patterns ................................................................................................... 5-1 5.1.1 Travel Demand and Patterns .................................................................................................... 5-1 5.2 Transit ......................................................................................................................................................... 5-4 5.2.1 Regional Transit .......................................................................................................................... 5-4 5.2.2 Local and Sub-Regional Bus Transit .................................................................................... 5-27 5.3 Freeway Operations ................................................................................................................................ 5-34 5.3.1 Freeway Volumes .................................................................................................................... 5-35 5.4 Arterials and Local Streets ..................................................................................................................... 5-51 5.4.1 Traffic Volume Forecasts ....................................................................................................... 5-52 5.4.2 Traffic Operations ................................................................................................................... 5-56 5.4.3 Property Access and Local Circulation ................................................................................ 5-88 5.5 Nonmotorized Facilities ......................................................................................................................... 5-98 5.5.1 Pedestrian Facilities ................................................................................................................. 5-99 5.5.2 Bicycle Facilities ..................................................................................................................... 5-114 5.6 Freight Mobility and Access ............................................................................................................... 5-124 5.7 Parking ................................................................................................................................................... 5-129 5.8 Safety ...................................................................................................................................................... 5-140 6 Construction Impacts ................................................................................................................... 6-1 6.1 General Corridorwide Construction Effects......................................................................................... 6-2 6.1.1 Truck Volumes and Haul Routes ............................................................................................ 6-3 6.2 Segment A: Seattle to Shoreline ............................................................................................................. 6-4 6.2.1 Preferred Alternative: At-grade/Elevated with NE 145th and NE 185th Street Stations ...................................................................................................................................... 6-10 6.2.2 Alternative A1: At-grade/Elevated with NE 145th and NE 185th Street Stations .... 6-14 6.2.3 Alternative A3: Mostly Elevated with NE 145th and NE 185th Street Stations ......... 6-16 6.2.4 Alternative A5: At-grade/Elevated with NE 130th, NE 155th, and NE 185th Street Stations ..........................................................................................................................
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