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Study Methods and Assumptions • Analysis conditions and study area
• Demand forecasts and projects
• Performance measures
• LOS standards
DRAFT ANALYSIS FOR',EEVI
.0 0 0
· o 0 0
Conditions and Study Years ,
Conditions Year
- - - . -- - -I I:
If Existing1 No~B.µild1 I Constrµc_t i9rtl Ultimate I - . ' - -
2016 x 2020 x x 2035 x x
• Existing & No-Build Conditions
• Ultimate Condition - Assumes both 1-90 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
DRAFT AN!\LYSIS FOR RE'i
Conditions and Study Years
• East Link Construction - Mid-point of construction (2020)
- 1-90 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
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Study Area
\ ¥ \ 1 ~ J' . \ \
.......... ~- .9 .. . • 1 :s .. _ .. -~---~
• 1-90 from 1-5 to 1-405 • Analysis conducted for both AM and PM peaks • Study area includes freeway and lo.c~at S;tu.eets
DRAFT ANALYSIS iFFOR REVI
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·o o o Future Forecasts and Projects
• PSRC model - Forecasts for 2020 and 2035
- Utilize PSRC adopted Land Use Targets forecast
• Sound Transit model - Bus and light rail ridership forecasts
• Reasonably foreseeable projects: - Includes Connecting Washington projects
- 1-90 Two-Way Transit is completed immediately prior to East Link construction
- ST 2 program is complete by 2035
- ST 3 is not assumed
DRAFJi ANALYSIS F.OR RE~
Performance Measures and Standards
• Performance Measures - Vehicle and transit demand forecasts
- Intersection LOS and vehicle queues
- Vehicle travel times
• Agency LOS Standards -WSDOT LOSE
- Mercer Island (town center) LOS C
- Mercer Island (outside town center) LOS D
• VISSIM and Synchro used for analysis results
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Draft Analysis Results
• Existing Conditions/Field Verification
• Future Traffic Forecasts and Travel Patterns
• Intersection LOS
• Travel Times on Mercer Island
• 1-90 Ramp Operations
Existing Conditions Intersection LOS ~
20161Exlstfn1 ,tandltlons -
l LOS lhtersection1
ID lnter5eCtton• - I 1stanifan11
201 W Mercer Way/1-90 Ramp E 202 W Mercer Way/SE 24th Street D A B
203 76th Avenue SE/N Mercer Way/1-90 Westbound on-ramp E A c 204 76th Avenue SE/SE 24th Street c A B
205 77th Avenue SE/N Mercer Way c 0 E 206 77th Avenue SE/1-90 Westbound express lanes ramp E A B
207 77th Avenue SE/1-90 Eastbound Off-Ramp E B B
208 77th Avenue SE/Sunset Highway SE c B c 209 77th Avenue SE/SE 27th Street c B B
210 80th Avenue SE/N Mercer Way c c c 211 80th Avenue SE/1-90 WB/EB HOV Direct access E A B
213 80th Avenue SE/SE 27th Street c B c 214 81st Avenue SE/North Mercer Way D c B
215 Island Crest Way/N Mercer Way/1-90 Westbound off-ramp E B c 216 Island Crest Way/1-90 Eastbound On-Ramp E c c 217 80th Avenue/SE 28th Street c A 8
218 Island Crest Way/SE 28th Street c c c 220 Island Crest Way/SE 40th Street D c D
221 78th Avenue/SE 40th Street D A c 222 East Mercer Way/1-90 Westbound ramp E B c 223 East Mercer Way/1-90 Eastbound off- ramp E 8 A
224 East Mercer Way/1-90 Eastbound on-ramp/SE 36
Notes: 1
- LOS Standards by agency are: Mercer Island - LOS D (LOS "C"for Town Center Arterial Intersections), WSDOT- LOSE
DRAFJ" AN~LYSIS frGF.l· F.tE\llEW
0 0 0
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Existing Conditions Travel Times llDl•s..19 - ) ~ROA~OK; ' I"- \ t I
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Route 38 T 76th Avenue . , ... SE (via N Mercer Way)
ft • IC
~ .....
MERCEJ ;,~\VIII ICJWn l..t!nlll!f'I I r· 1 o~~ I Travel Time Route
ISi.AND 1'41.1
... .,.!
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r : ' !Ci I 1 - W Mercer Way
II Jtzn11111., l -,,.
~· ? ~1 I 2 - Island Crest Way al ,.,,. - I
.;;,.:; - - -- - (Outer Roadway)
~ 'l ·-
" :::""' .. .i
l ;:I J 3A- 76'h Avenue SE
II ); r
r/ /J(' :
-- (via Town Center)
!- It i . .,,, ..
f f .. i 38 - 76th Avenue SE
Route 1 • W Mercer way •x ti h ~ trl . i · U.TI:>S.
""-.- __ _ I ii t ' ... (via N Mercer Way) " .. r
AM Peak Travel lime (minutes)
I 7
5
' --
7 ----- -
7
Travel Pattern Field Verification
• Conducted origin-destination counts on N. Mercer Way in AM - Up to 60 vehicles/hour use Island Crest Way WB off
ramp to 77th WB center roadway on-ramp
• Average vehicle occupancy (AVO) count on 1-90 and Island Crest Way ramp - 16°/o HOV share in the WB direction in AM
• Ramp utilization in PM period
D~AFT ANAl.L YSIS iF0H IREV..1
.0 0 0
·o o o 1-90 and Mercer Island Traffic F'orecasts
1-90 across Lake Washington
AM Peak Hour
PM Peak Hour
.Existing 201.6.
11,800 vehicles
13, 100 vehicles
Future 2035
12,900 vehicles
14,400 vehicles
Percent Growth
9%
10%
Mercer. 11sland L Existing 2016 _JL_ Fu~~re 2035 _!l Percent -
HOV 0;0
I Growth , ~
Total Volume HOV 0/o Total Volume - _J '
AM To Mercer Island 2,500 13% 2,750 13% 10% Peak Hour From Mercer Island 3,300 14%
; 3,700 14% 12% i
-
PM To Mercer Island 3,400 17% 3,850 17% 13% Peak Hour From Mercer Island 3,250 19% 3,550 I 19% 9%
Source: PSRC model
DRAF.T ANALYSIS FOR REVI
Mercer Island AM WB 2035 Travel Patterns
0
- -·----- -- -~- "-. ·~
Nat· to Sc=* ·761hA~SE on-«amp
:ll t'I ~ t W Mercer Way
51 ~ . on-Ramp
r.MT:J 430 I -635 ~tltn~
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Bulld1 -Bulld2
Build Opt 1 Westbound On-Ramp Volume
Build Opt 2 Westbound On-Ramp Volume
11 :+ : jl Build Opt 2 Volume Is Greater than Build Opt 1
Build opt 2 Volume Is Less than Build Opt 1
Build Opt 2 Volume Is Equal to Build Opt 1
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DRAIT ANAILYiSIS .FOR i~EVIE
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E Mercer Wlfl Oft.Ramp
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Mercer Island PM EB 2035 Travel Patterns - .---..----..---
Nol!to5'*
i Roanoke / "lil'Xt!ISI
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W~Wayu
Off-Ramp
235
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Off-Ramp
~ ~80 17-
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~ Bulld Opt 1 westbound on-Ramp Vobne
hiidil Buld Opt 2 Westbound Oft-Ramp Vobne -~
Bulld Opt 2VolumeIsGreaterthanBulldOpt1
BuUd Opt-2 Volume Is Less than Bulld Opt 1
Bulld Opt 2 Volume is Equal to Build Opt 1
Island crest Way Off-Ramp (HOV)
-·llllO ~ I 630 ·---""" I 210
-420
r· <Mlwr IC:~
Island Oest Way M - ..
a: <;:: * Offf-~Ramp fOUt~:)
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DRAFT ANALYSIS ·FOF.:UREVI
1,
r
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l \ E Mera!rWay ~ Off-Ramp
N
"~ - ~·211 .-...,. . i'
~ 1 ~
, ..._ lllW-< I ~ ~~35 ~I' I 135 ~' ~-·~ \
Ir © : "\'I' '\ ..... "' t \. \ 4- ,AOC IJ ~ I~ II \ ~ J.':.. J - •--1.~
Initial Future 2035 AM Results 76"' Avenue SEIN Mercer Way/ 1.90J B "li:lla r 1' L Bulld"Optlon 2 JL Build Optlolli2
Westbound On-ramp ur - · ·- P ion J ! (unmitigated) (mitigated) -- - - __, --- -
Intersection LOS LOSB LOSE
AM Westbound approach LOS LOSC LOS F Peak Hour Westbound Queue Length1 425 feet >1/2 mile
Travel Time2 4 mins >10 mins Notes: 1 - Queue storage length is 750 feet to adjacent intersection at 771h Ave SEIN Mercer Way 2 - Travel time route begins at Island Crest Way/SE 28th Street and ends at W Mercer Way on-ramp gore
Notto Scale
Route - Via N Mercer Way
~
f SE74UI "t
i ~ ~ ~ XI
From: Island Crest Wav/SE 28th Street To: Westbound 1-90 via 76th Avenue SE On·ramp
~ ;f !l ~ > > ;; '
DRAFT ANALYSIS frOR F.lEV:IE
0
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4-~
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f f 7 > 1:1
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SE 2-CUISI
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t iv
Luther Butbank P:ltlc
I
• Mercet lshlt!d Ct>mmiiiiity & E
BEAUMONT
LOSS
LOSB
425 feet
4 mins
0
· o o o 761h WB On-Ramp Modification
• Modified 76th WB on-ramp and ramp terminal to: - Based on 2035 analysis, modify transit-only bypass to
a metered shoulder when storage is needed (similar to Island Crest Way eastbound on-ramp).
- Adjusted ramp metering rate to accommodate onramp demand
- Signalize 76th/North Mercer Way ramp terminal
0
Year 2035 Intersection LOS 2035 Future Conditions
Intersection I ID lnlersectJon
AMPHkttour PM Peek ttour LOS
standanf" :1 BulJd 201 llW Mercer Way/1-90 Ramp I E I B I 8 II B I C
2
202 W Mercer Way/ SE 24th Street D A B B B ,
1 203 76th Avenue SE/ N Mercer Way/1-90 Westbound on-ramp E B B C C '
I 204 76th Avenue SE/ SE 24th Street C 8 B B 8 • • 205 nth Avenue SE/ N Mercer Way c B B A A I
206 lnth Avenue SE/HID Westbound express lanes ramp I E
207 lnth Avenue SE/1·90 Eastbound Off·Ramp I E
208 I 77th Avenue SE/ Sunset Highway SE I C
209 I nth Avenue SE/ SE 27th Street I C 210 l80th Avenue SE/ N Mercer Way I C 211 l80th Avenue SE/ 1-90 WB/ EB t!OV Dlrea access I E
212 l80th Avenue SE/1-90 EB HOV Oirea access I E
213 l80th Avenue SE/ SE 27th Street I C -
214 81st Avenue SE/ North Mercer Way 0 215 Island Crest Way/ N Mercer Way/ 1·90 Westbound off-ramp E
216 II Island Crest Way/1·90 Eastbound On-Ramp I E
217 IBOth Avenue/ SE 28th Street I C
218 I ls land Crest Way/ SE 28th Street I C
219 I Island Crest Way/ SE 30th Street I C
220 I Island Crest Way/ SE 40th Street I D
221 l78th Avenue/SE 40th Street I D
222 I East Mercer Way/1-90 Westbound ramp I E
223 I East Mercer Way/1-90 Eastbound off-ramp t E
224 !East Mercer Wav/1-90 Eastbo~nd on-ramp/SE 36th Street I E
Notes:
B B
B
c B A
c c c c B
c N/A
c A 8
B
6
B I B I B
B ll C I C
6 I B I B c ,, c l c B I 8 I B A I A I A c I c - 11 - c
c I c I c c c c c I c I c B I B I B c I c I c
N/A I N/A I N/A C I D I D A I B I B 8 ~c I c
: I : I : I 1
• LOS Standards by agency are: Mercer Island - LOS D (LOS "C" for Town Center Arterial Intersections ), WSDOT • LOS E LOS resutts include all East Li nk Fina l EIS mit igation and 76th Avenue ramp mod if ications.
DRAFT ANALYSIS lr'OR REV·IE
0 0
0 0 0
Year 2035 AM Travel Times
---
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~-'*-•
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Rout~ l • W Mam Way 111;. ~-
1 1\ I I ~ I: ; I- '- ·z • ll " .: . 'C I
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DRAFr ANALYSIS FOR !REV
Travel Time II AM Peak Travel llme (mlns)
Route Ill Build Opt 1 Build Opt 2
1 - W Mercer Way 7 7
2 - Island Crest Way 4 3
3a - 761h Avenue SE 7 9 (via Town Center)
3b - 761h Avenue SE 7 9 (via N Mercer Way)
Average Travel Time 6.0 7.5 {weighted by traffic volume)
Potential Intersection Mitigation
West Mercer Way & 24th Mercer Island Final EIS Southbound left-turn Avenue SE
80th Avenue SE & SE 27th Mercer Island Final EIS Install traffic signal Street
77th Avenue SE & North Mercer Island Final EIS Install traffic signal Mercer Way
77th Avenue SE & 1-90 WSDOT Final EIS Install traffic signal eastbound off-ramp
North Mercer Way & 76th WSDOT Final EIS/ Final EIS - Modify westbound westbound on-ramp Updated Analysis channelization
Updated analysis - install traffic signal and modify ramp
76th westbound on-ramp WSDOT Updated Analysis Re-stripe transit only bypass to metered shoulder when needed
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