23rd Ave E Vision Zero Project

Updated: September 27, 2019

What’s happening now?

Upcoming Work

Starting as soon as September 28, we'll add High Friction Surface Treatments (HFST) at intersections where collision rates are high when road conditions are wet and slippery:

  • 24th Ave E/E Louisa St
  • 24th Ave E/E Lynn St
  • 24th Ave E/E Helen St/Turner Way

Construction map of E Louisa St and E Lynn St
Work area on 24th Ave E from E Boston St to E Louisa St

Map of project area showing detour routes for pedestrians
Work area on E Turner Way at E Helen St

These surface treatments add a thin layer of course material on top of the street to improve skid-resistance to the pavement. To prepare for installation of these treatments, crews may "power wash" the pavement and temporarily remove some striping. Any striping that is removed will be reinstalled after the HFST has set. This work is anticipated to last for up to 2 weekends and is weather dependent.

What to expect:

  • Weekend (Saturday and Sunday) work from 7 AM - 10 PM. No noisy work will occur before 9 AM
  • Noise, dust, vibration, and large machinery
  • "No Park" signs in work area 72 hours in advance of work
  • Temporary and intermittent traffic and lane restrictions

We are now in design for Segment 2 and expect to complete design work later this year. Construction is expected to begin in early 2020. For more details, please see below under the Segment 2 section.

What's next

Sign up on our project listserv to receive project updates and learn about future public involvement opportunities. For the latest project updates, see our email update archive. Interested in learning about transportation improvements happening on the southern end of 23rd Ave E? Visit the project website.

Project Overview

We're enhancing safety and mobility on 23rd Ave E/24th Ave E between E John St and E Roanoke St as part of our Vision Zero efforts to reach zero traffic deaths and serious injuries by 2030. The work will be done in two pieces over 2018 and 2019.

Segment 1 - Lane Rechannelization 

Data shows that people driving northbound between Boyer Ave E and E John St on average are going 39 MPH. The posted speed is 30 MPH. The chances of someone being fatally or seriously injured increase significantly being struck at 40 MPH versus 30 MPH.

In the last 3 years, there have been 134 total collisions on this portion of the corridor. These crashes caused 63 injuries to people walking, biking and driving. There has been 1 fatal collision on this street in the last decade. This important street provides access to the Montlake neighborhood, SR 520, and the Montlake Bridge crossing into north Seattle and is a vital street for transit.

Modeling and experience indicated we could make the change without having a significant impact on capacity and that it will encourage speeds closer to 30 MPH. We are monitoring this low-cost investment to see how the street operates post-implementation.

Speed signs

Segment 2 - Crossing and transit stop improvements 

We heard from the Montlake community that traffic calming, reducing speeds, and pedestrian safety are the top transportation priorities on 23rd Ave E/24th Ave E. In addition to implementing the recommended design and installing skid-resistant surface treatments, we're using your feedback and conducting additional analyses to determine where we might enhance transit stops, install a new traffic signal, modify parking, and add new curb ramps within the project area. We have updated the design based on feedback from the community for several of the below improvements.

We're currently working on design for several improvements along the corridor including:

  • New walk/bike signal and associated curb ramp improvements at E Lynn St

New walk and bike signal improvements at E Lynn St

  •  Protected northbound, southbound, and eastbound left-turn signal phases at 23rd Ave E/E John St

	Protected northbound, southbound, and eastbound left-turn signal phases at 23rd Ave E/E John St

  • 2 striped curb bulbs at 24th Ave E/E Louisa St and 23rd Ave E/E Ward St

	2 striped curb bulbs at 24th Ave E/E Louisa St and 23rd Ave E/E Ward St    	2 striped curb bulbs at 24th Ave E/E Louisa St and 23rd Ave E/E Ward St

  • Bus stop amenity improvements

Curb bulbs

Curb bulbs reduce the number and severity of traffic collisions by increasing the visibility of vulnerable users - people walking and biking - and decreasing the distance they have to travel to get across the street.  

High friction surface treatment

HFST adds a thin layer of coarse material on top of the street to improve skid-resistance to the pavement. We're adding HFST at intersections where collision rates are high when road conditions are wet and slippery.  

Signalized crosswalk

Install signalized crosswalk. Walk/bike signals stop car traffic to allow people who walk and bike to safely cross the intersection.

Protected left turn signals

Protected left-turn signal phases (northbound, southbound, and eastbound) will reduce opportunities for collisions.  

Upgraded traffic signals

New signal heads and upgraded signal arms will enhance safety and improve visibility.   These improvements are expected to reach full design later this year and go into construction as soon as summer 2020. 

Design Map

Project map

Other projects in the neighborhood:

Schedule

Summer 2017

Share what we heard to date and suggest possible near-and long-term alternatives

Spring 2018

Share conceptual design of near-term safety improvements

Summer/Fall 2018

Segment 1 construction of recommended design (E John St to Boyer Ave E) completed

2019

Installation of skid-resistant surface treatments at intersections with high collision rates

Complete design for Phase 2 additional improvements along the corridor

2020

Complete design for Segment 2 additional improvements along the corridor

Construction of Segment 2 improvements (schedule subject to change)

Funding

This project is funded by the 9-year Levy to Move Seattle, approved by voters in 2015, the City general fund, and through the Seattle Transportation Benefit District.

Materials

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