highland park way sw and sw holden st safety project...sw holden st sw henderson st 16 th w sw...

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


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


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


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


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


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)


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)


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)


20 MPH)


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




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 Elementary

Westcrest Park


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


30 MPH)

12th

Ave

SW

Existing bus stop

Existing traffic circle

Existing zig-zag and

medians


Why speed matters?

• Speed is the critical factor in the frequency and severity of a crash

• Key part of Vision Zero’s efforts


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


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


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 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


Please take our survey!

www.surveymonkey.com/r/highlandholden

Translation services available (206) 727-8697

Provide input by May 31st


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


Questions?

[email protected](206) 900-8741

www.seattle.gov/transportation/HighlandParkSafetyImprovements

highland park way sw and sw holden st safety project...sw holden st sw henderson st 16 th w sw...

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