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2 Study Methods and Assumptions Refresher Conditions and years Study area Future forecasts and projects Performance measures DRAFT.ANALYSIS FOR RE"' -

3 Conditions and Study Years I -_(;>nditiol].s! I - Vear. I Existing - l!jltimate N.o Ba..ild I Construction: - - I x 22 x x 235 x x Existing & No-Build Conditions Ultimate Condition (235) - Assumes both 1-9 Two-Way Transit and HOV and East Link projects are built and operating - Option 1: Ml vehicles able to use HOV lanes and ICW - Option 2: Ml vehicles restricted from HOV lanes and ICW

4 Conditions and Study Years East Link Construction - Mid-point of construction (22) Two-Way Transit and HOV Project completed - Operational Scenarios: Ml SOV eligible to use the HOV lanes and ICW Ml SOV restricted from the HOV lanes and ICW HOV lane converted to a general-purpose lane DEAFT ANALYSIS FOR 1 RE\l

$- 1-9 Study Area Boundary '"",_ ' I \ r o:.. \ \!,,. ::. -.$

5 1-9 Freeway Study Area i r tea., Study Area Boundary '"",_ ' I \ r o:.. \ \!,,. :: between western terminus and 1-45 Analyzed both AM and PM peak periods DRAFT ANALYSIS FOR RE\l

$Iii' SE 27th St.,.,..., co g. g. Mercer Island Study Area 1-9lJ.lll l(si r2'.!l Q 1iE'211!1:ll. l \ '! co -:r.rj.e't",<p... 4'. l tnl-,. :r I<! SE t - ".. ): '..._.,... "' I -1-'. - - 17or.$

6 Iii' SE 27th St.,.,..., co g. g. Mercer Island Study Area 1-9lJ.lll l(si r2'.!l Q 1iE'211!1:ll. l \ '! co -:r.rj.e't",<p... 4'. l tnl-,. :r I<! SE t - ".. ): '..._.,... "' I -1-' or.. ' MC :>IL VARA ' w.,. $l'.27msr if '",.... i. ;; I Jc: 11'1 IC; DETAIL.:m1 st:?all\!. ";# r i:: l:l J r IC! :ff"!f.. a- ' f i.. Oi la a II\ I<! "'""- - se'%<41l CJ...,.i. ;... I r;: ' l.l.llnt. IJurtJanlc',...,,. _. ' lb - BEAUMONT Sf.Vin Q."":A ii 11 / ti! i ll.,,,, I,.,.,. I Q.Q :r... J'. tt H... a: I? i i 1.. f e ix I - JR,.; a st'6:r>si; i.\\.. r U3'11hQ" a.. -t' ' i... > '. ' \, I ll1 \ -., 9 R, - r:i 71t'I St ' "' 1:.. I $.i DRAFT ANAlYSIS FOR EEVIE

Future Forecasts and Projects PSRC model - Forecasts for 22 and 235 - Utilize PSRC adopted Land Use Targets forecast Sound Transit model - Bus and light rail ridership forecasts Reasonably

7 Future Forecasts and Projects PSRC model - Forecasts for 22 and Utilize PSRC adopted Land Use Targets forecast Sound Transit model - Bus and light rail ridership forecasts Reasonably foreseeable projects: - Includes Connecting Washington projects Two-Way Transit is completed immediately prior to East Link construction - ST 2 program is complete by ST 3 is not assumed

Freeway Performance Measures 1-9 freeway measures: - Vehicle and transit demand forecasts - 1-9 congestion diagrams/level

8 Freeway Performance Measures 1-9 freeway measures: - Vehicle and transit demand forecasts congestion diagrams/level of service - Travel times - Vehicle and person throughput VISSIM and Synchro used for analysis results DRAFT ANALYSIS FOR REV.

Existing Results and Calibration Based on 216 data Synchro and VISSIM - Intersection LOS and queues - 1-9 travel times, throughput and congestion diagrams 1-9 Freeway

9 Existing Results and Calibration Based on 216 data Synchro and VISSIM - Intersection LOS and queues travel times, throughput and congestion diagrams 1-9 Freeway Calibration - FHWA Simulation Guidelines and WSDOT VISSIM Protocols Volumes, Travel Times, Congestion Maps Met both FHWA and WSDOT guidelines and congestion reflects field conditions

10 Draft 235 Analysis Results Mercer Island 1-9 travel patterns 1-9 congestion maps 1-9 travel times to/from Mercer Island 1-9 vehicle and person throughput

$AM Peak Period Travel Patterns To/From Mercer Island Mercer Island to Seattle Etside to Mercer Island - - 3% 29%,,.i e to Island '\.$

11 AM Peak Period Travel Patterns To/From Mercer Island Mercer Island to Seattle Etside to Mercer Island - - 3% 29%,,.i e to Island '\. Total Trips To/From Mercer Island Mercer Island to Eastside To Ml 6,5 7,2 From Ml 7,7 8,7 Peak period 6:3AM lo 1 O:OOAM ID RAFT ANAL YS'IS F.OR REVI

12 PM Peak Period Travel Patterns To/From Mercer Island Mercer Island to Seattle Qi Eside to Mercer Island LEU..Jti& c:a Pl - ""'.t v». -E,,.I... r I'll, "' i Total Trips To/From Mercer Island - Mercer Island to Eastside,, To Ml 8,9 1,6 From Ml 7,6 9, Peak period = 3:3PM to 7:PM DRAFT ANAl!. V.S IS ifgr lrlevi

13 "' c. ca :E c 1:J c:: :J 1..., _g Cl) No Build Ultimate 1 () DRAFT - For Internal Re11few Only Material has not been ff!lllewed or OPPRJlll!d by any party - c:: bd. l j. Q).. (.) I 1 I -- I -- 1:J c:: :J :9-1 :::c:;j -,... -, t. t LRT LRT 13 DRAFT ANALYSIS FOR REVIEW

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15 Ultimate 2: 1-9 Eastbound Congestion Congestion forms between 1-5 and the Mt. Baker tunnel Consider modifying the transition location of the eastbound HOV lane to begin east of Mt. Baker tunnel

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17 tn c. cu :E c... - tn \J c:: :::s Cl) Q) '- C) c (15 :E CL Lt) M N \J (/) No Build '" l t "9 17 DRAFT ANALYSIS FOR REVIEW Ultimate 1 LRT Ultimate 2 LRT DRAFT- For Internal Review Only Matedal has not been rrvlewed or approved by any party H Ultimate 2 Modified LRT HN......

$(Bellevue) Developing for SOV, HOV and Transit Data shown is only travel time on 1-9 - does not include travel time on Mercer Island streets.. \ \. ',,,...,. '\... '" " lj ' \ I. \ ii l.$

18 1-9 Travel Times Developed to/from Mercer Island - Includes all on- and off-ramps on Mercer Island - Western 1-9 endpoint is at 4th Avenue (Seattle) - Eastern 1-9 endpoint is at 1-45 (Bellevue) Developing for SOV, HOV and Transit Data shown is only travel time on does not include travel time on Mercer Island streets.. \ \. ',,,...,. '\... '" " lj ' \ I. \ ii l.. \ t

19 235 AM Peak Period SOV Travel Times: To Mercer Island., From Bellevue (1-45) - To East Mercer Way and Island Crest Way From Seattle (4 1 h Avenue) - To West Mercer Way, 77th Avenue SE, Island Crest Way arid East Mercer Way XIX Ultimate 2 I Ultimate 2 Modified "Ultimate 2 Modified adjusts the beginning of the eastbound HOV lane to east of the Mouftl Baker,T1 DRAFF ANALYSIS F.OF.l REVl

$' " :ii- s- = ii '41 4 \ "-t, To Bellevue ( 1-45) i Id - From East Mercer Way and Island Crest Way To Seattle (4th Avenue) - From West Mercer Way,?$

20 235 AM Peak Period SOV Travel Times: From Mercer Island v.t... <t?' " :ii- s- = ii '41 4 \ "-t, To Bellevue ( 1-45) i Id - From East Mercer Way and Island Crest Way To Seattle (4th Avenue) - From West Mercer Way,?6th Avenue SE, Island Crest Way and East Mercer Way No-Build includes 77th Ave and Island Crest W DRAfrT ANALYSIS,FQH.fREVIE

21 235 PM Peak Period SOV Travel Times: To Mercer Island H From Bellevue (1-45) - To E. Mercer Way and Island Crest Way From Seattle (4th Avenue) - To W. Mercer Way, 77th Avenue SE, Island Crest Way and E. Mercer Way - No-Build includes 77th Ave and Island Crest Way via centelr XIX.. Ultlmale 2 I Ultimate 2 Modified l>ultlmate 2 ModlHed adjusts lhe beginning of the eastbound HOV lane to east of.the Moun! DMFT ANALYSIS ffof.t REV

22 235 PM Peak Period SOV Travel Times: From Mercer Island r'!!l Ml%11i!M m11.f!1, 'P:Jll_fllt=... MT (Q : ; fj 1 ' '1 ' M To Bellevue ( 1-45) 13 - From East Mercer Way and Island Crest Way To Seattle (4th Avenue) - From West Mercer Way, 76th Avenue SE, Island Crest Way an f East Mercer Way DRAF;r ANALYSIS.FOAi RE\llE

23 235 AM Peak Period Vehicle and Person Throughput w Mercf!l tstond " Vehicle 41,1 43,1 42,2 Vehicle 43,9 45,8 45,1 Person 65,9 77,6 n,2 Person 67,8 79,7 79,2 A from NB - 18% 17% A from NB - 18% 17 /o 'Results for Ulllmale 2 Modified *Vehicle and person throughputs include all modes (SOV, HOV, transit, elc.) DRAFT ANALYSIS FOR REVI

24 235 PM Peak Period Vehicle and Person Throughput Q1 ij:j Floating Bridge i...,. Men::er bland " Vehlcle 41,5 46, 44,3 Vehicle 43,7 5,7 4a,.5 Person 65,9 81,4 8,7 Person 65,4 85,8 84,5 fl from NB 24% 22% fl from NB 31% 29% Results for Ultimate 2 Modified vehicle and person throughputs Include all modes (SOV, HOV, transit, elc.) DRAFT ANALYSIS.F.OH REV.JE

Interstate 90 and Mercer Island Mobility Study APRIL Commissioned by. Prepared by

Interstate 90 and Mercer Island Mobility Study APRIL 2017 Commissioned by Prepared by Interstate 90 and Mercer Island Mobility Study Commissioned by: Sound Transit Prepared by: April 2017 Contents Section