LYNNWOOD LINK EXTENSION DRAFT ENVIRONMENTAL IMPACT STATEMENT Transportation Technical Report JULY 2013 Lynnwood Link Extension | Draft Environmental Impact Statement Table of Contents 1 Introduction ...................................................................................................................... 1-1 1.1 Project Background ................................................................................................................................... 1-1 1.2 Purpose of Technical Report ................................................................................................................... 1-2 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 ....................................................................................................................................................... 4-21 4.2.1 Transit Operations and Level of Service ................................................................ 4-21 4.2.2 Regional Transit ......................................................................................................... 4-25 4.2.3 Local and Sub-Regional Transit ............................................................................... 4-37 4.3 Freeway Operations ................................................................................................................................ 4-40 4.3.1 Evaluation Methodology .......................................................................................... 4-40 4.3.2 Freeway Volumes ....................................................................................................... 4-42 4.3.3 Freeway Speeds and Level of Service ..................................................................... 4-44 4.4 Arterials and Local Streets ..................................................................................................................... 4-47 4.4.1 Traffic Operations ..................................................................................................... 4-48 4.4.2 Property Access and Local Circulation ................................................................... 4-60 4.5 Nonmotorized Facilities ......................................................................................................................... 4-65 4.5.1 Pedestrian Facilities ................................................................................................... 4-66 4.5.2 Bicycle Facilities ......................................................................................................... 4-77 4.6 Freight Mobility and Access .................................................................................................................. 4-88 4.6.1 Key Freight Roadways .............................................................................................. 4-88 Transportation Technical Report v July 2013 Lynnwood Link Extension | Draft Environmental Impact Statement 4.7 Parking ...................................................................................................................................................... 4-93 4.7.1 Segment A: Seattle to Shoreline .............................................................................. 4-94 4.7.2 Segment B: Shoreline to Mountlake Terrace ........................................................ 4-98 4.7.3 Segment C: Mountlake Terrace to Lynnwood ................................................... 4-100 4.8 Safety ...................................................................................................................................................... 4-102 4.8.1 I-5 Ramps and Ramp Terminals ............................................................................ 4-103 4.8.2 Local Intersections ................................................................................................... 4-104 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 ....................................................................... 5-30 5.3 Freeway Operations ................................................................................................................................ 5-35 5.3.1 Freeway Volumes ....................................................................................................... 5-36 5.4 Arterials and Local Streets ..................................................................................................................... 5-48 5.4.1 Traffic Volume Forecasts ......................................................................................... 5-49 5.4.2 Traffic Operations ..................................................................................................... 5-54 5.4.3 Property Access and Local Circulation ................................................................... 5-83 5.5 Nonmotorized Facilities ......................................................................................................................... 5-91 5.5.1 Pedestrian Facilities ................................................................................................... 5-92 5.5.2 Bicycle Facilities ....................................................................................................... 5-102 5.6 Freight Mobility and Access ............................................................................................................... 5-108 5.7 Parking ................................................................................................................................................... 5-113 5.8 Safety ...................................................................................................................................................... 5-122 6 Construction Impacts ....................................................................................................... 6-1 6.1 General Corridorwide Construction Effects......................................................................................... 6-1 6.2 Segment A: Seattle to Shoreline ........................................................................................................... 6-10 6.2.1 Alternative A1: At-grade/Elevated with NE 145th and NE 185th Street Stations ........................................................................................................................ 6-12 6.2.2 Alternative A3: Mostly Elevated with NE 145th and NE 185th Street Stations ........................................................................................................................ 6-16 6.2.3 Alternative A5: At-grade/Elevated with NE 130th, NE 155th, and NE 185th Street Stations .................................................................................................. 6-16 vi Transportation Technical Report July 2013 Lynnwood Link Extension | Draft Environmental Impact Statement 6.2.4 Alternative A7: Mostly Elevated with NE 130th, NE 155th, and NE 185th Street Stations .................................................................................................. 6-19 6.2.5 Alternative A10: At-grade/Elevated with NE 130th, NE 145th, and NE 185th Street Stations .................................................................................................. 6-19 6.2.6 Alternative A11: Mostly Elevated with NE 130th, NE 145th, and NE 185th Street Stations .................................................................................................. 6-20 6.3 Segment B: Shoreline