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Department of TransportationJames LeMay 2020
Highland Park Way SW and SW Holden St Safety ProjectVision Zero Project
Department of Transportation
Presentation overview
•Background
•Existing conditions
•Proposed changes
•Next steps
Department of Transportation
West Seattle High-Rise Bridge Closure
• Significant impacts to Highland Park
• Neighborhood is a priority for SDOT
• Temporary signal installed in early April
• Presented at Highland Park Action Committee (HPAC) meeting on April 23• Responded to requests on May 5
• Next steps• Developing a neighborhood specific plan
• Attending the May 27 HPAC meeting
Department of Transportation
Project goals
• Improve safety for ALL
• Identify neighborhood traffic issues
• Make traffic signal at Highland/Holden permanent with new curbs and sidewalks
• Provide bicycle facility between Duwamish Trail and Highland Park
• Opportunities for public input
9thA
ve S
W
Highland Park Playground
Highland Park Elementary Westcrest
Park
SW Holden St
SW Henderson St
16th
Ave
SW
SW Cloverdale St
Highland Park Improvement Club
SW Kenyon St
N
SW Trenton St
Department of Transportation
Background
• Major route into/out of West Seattle
• +20,000 people walking/rolling, biking, and driving through intersection every day
• Sightline issues (11% grade)
• Serves Metro route #131
• Multi-use path east side of Highland Park Way SW
• Funded by Mercer Megablock proceeds and Move Seattle
Temporary traffic signal at Highland/Holden installed April 2020
Department of Transportation
Crashes
•195 total crashes within the last 5 years (2015-2019)•4 pedestrian•3 bicycle•6 serious injury•1 fatal
9thA
ve S
W
SW Holden St
SW Henderson St
16th
Ave
SW
SW Cloverdale St
SW Kenyon St
SW Trenton St
SW Thistle St
12th
Ave
SW
N
SW Austin St
Department of Transportation
Traffic volumesTraffic volumes along Highland Park Way SW and W Marginal Way SW have increased since bridge closure
0
5,000
10,000
15,000
20,000
25,000
30,000
16th Ave S 35th Ave SW Delridge Way SW SW Roxbury St W Marginal Way SW Highland Park Way SW
Ave
rage
wee
kday
tra
ffic
vo
lum
e
West Seattle traffic volumes before/after bridge closure
2018(prior to bridge closure)
Week of4/12-4/19 (after bridge closure)
Department of Transportation
Speeds
• Recent speed studies were collected December 2019
• Speed cushions/humps can reduce vehicular speeds• May impact emergency response• May increase noise levels• Not installed where roadway slope is
greater than 8%• Typically installed where vehicular
speeds are +5 mph over speed limit
Speed cushions near 16th Ave SW/SW Myrtle St for Sanislo Elementary School (“Your Voice, Your Choice” and Safe Routes to School)
Department of Transportation
Speeds
See next slide for Highland Park south
9thA
ve S
W
16th
Ave
SW
SW Kenyon St
N
SW Elmgrove St
SW Thistle St
14th
Ave
SW
Roadway slope greater than 8%
Existing speed hump/cushion
Existing traffic circle
Existing bus stop
35-37 MPH(Speed limit =
30 MPH)
25 MPH(Speed limit = 20 MPH)
21 MPH(Speed limit = 20 MPH)
22-24 MPH(Speed limit = 20 MPH)
22-24 MPH(Speed limit = 20 MPH)
28 MPH(Speed limit =
20 MPH)
26 MPH(Speed limit =
20 MPH)
21 MPH(Speed limit =
20 MPH)
• Vehicles are traveling +5 mph over speed limit for segments shown in orange -will be evaluated for speed hump/cushions
• Vehicles are traveling less than 5 mph over speed limit for segments in blue
SW Portland St
SW Holden St
Roadway slope greater than 8%
Highland Park Playground
Department of Transportation
SpeedsSee previous slide for Highland Park north
SW Cloverdale St
SW Henderson St
SW Trenton St
NSW Thistle St
9thA
ve S
W
16th
Ave
SW
Highland Park Playground
Highland Park Elementary
Westcrest Park
Roadway slope greater than 8%
Existing painted curb
bulbs
Existing zig-zag and
medians
13th
Ave
SW
• Many traffic calming measures have been installed by Safe Routes to School and Neighborhood Greenways
• Greenways evaluating for additional traffic calming in this area
• Vehicles are traveling +5 mph over speed limit for segments shown in orange - will be evaluated for speed hump/cushions
35 MPH(Speed limit =
30 MPH)
12th
Ave
SW
Existing bus stop
Existing traffic circle
Existing zig-zag and
medians
Department of Transportation
Why speed matters?
• Speed is the critical factor in the frequency and severity of a crash
• Key part of Vision Zero’s efforts
Department of Transportation
What we’ve heard
• Install a traffic signal or roundabout
• Neighborhood cut-through traffic
• Crossing improvements along 9th Ave SW
• Provide left-turn signal phasing at 16th
Ave SW & Holden and Highland & Holden
• Increased pavement friction uphill on Highland Park Way SW
• Bike facility between Duwamish Trail and Highland Park neighborhood
Highland Park Way SW looking south
Department of Transportation
Short-term improvements• Temporary traffic signal (completed
April 2020)
• Left-turn lanes at 16th/Holden
• Traffic calming elements (Phase 1) being designed:• Reduce speed limit to 25 MPH• Parking lane lines and painted
curb bulbs along 9th Ave SW• Speed humps/cushions• Radar speed signs
Zig zag treatment at 9th Ave SW & SW Cloverdale St
Department of Transportation
Proposed improvements
• Permanent traffic signal at Highland/Holden with left-turn phasing
• Concrete curb bulbs and sidewalks
• Widening existing path on east side of Highland Park Way SW
• Southbound protected bike lane (re-evaluate when traffic volumes normalize)*
• Neighborhood traffic calming (Phase 2)*
* Evaluated as more data is being collected
9thA
ve S
W
Existing Delridge Greenways (2013)
Highland Park Playground
Highland Park Elementary
Westcrest Park
SW Holden St
SW Henderson St
16th
Ave
SW
SW Cloverdale St
Highland Park Improvement Club
17th
Ave
SW
SW Kenyon St
SW Webster St
SW Myrtle St
Highland Park Connection (2018)
N
• Evaluate for protected left-turn signal phasing • Permanent traffic
signal• Concrete curb bulbs
and sidewalks• Enhanced lighting
• Speed cushions• Painted curb bulbs to
shorten crossing distances at bus stops
• Widen existing path• Evaluate for increased
pavement friction going uphill
SW Trenton St
21th
Ave
SW Duwamish
Trail
Department of Transportation
Please take our survey!
www.surveymonkey.com/r/highlandholden
Translation services available (206) 727-8697
Provide input by May 31st
Department of Transportation
Next steps
What is happening When
Issues identification meeting May 2020
Design update and review meeting Fall 2020
Implement neighborhood traffic calming Q4 2020
Construction Q4 2021
Evaluation Ongoing
Department of Transportation
Questions?
HighlandHolden@seattle.gov(206) 900-8741
www.seattle.gov/transportation/HighlandParkSafetyImprovements
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