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Budget Information

I-90 - Snoqualmie Pass Vicinity - Improve Delineation

Vicinity map of solar-powered LED lane markings.
WSDOT is improving visibility on I-90 in strategic areas along the 15-mile corridor. View larger map.

Image of solar-powered LED lane markings. Crews plan to install solar-powered LED lane markers on I-90, similar to this picture, to define lanes and shoulders.


November 2014

  • Crews finished installing 4,600 solar-powered LED lane markers in both directions near the summit of Snoqualmie Pass.
  • WSDOT will monitor the new lane markings durability and longevity for the next three years.
  • WSDOT received a federal grant to install solar-powered LED lane markers on I-90 over Snoqualmie Pass.

One of the challenges of operating and maintaining 
I-90 over Snoqualmie Pass is being able to keep lane markings from fading.
In addition to rain and snow obscuring visibility, heavy
wear from snow removal operations, studded tires,
and vehicles with chains shorten the life of the
lane markings.

Winters on Snoqualmie Pass are severe with an average of 453 inches of snow fall each year.

Why is WSDOT installing solar-powered LED lane delineators on Snoqualmie Pass?
WSDOT hopes to improve visibility over Snoqualmie Pass 
by installing solar-powered LED lane markings and high visibility reflectors on shoulder and median barrier located in strategic locations along a 15-mile stretch of I-90. The LED lane markers will enhance roadway stripes and other roadway delineation. 

This pilot project will be the first to utilize solar-powered LED lane markers on a large scale in the state.

The End Result
The LED lane markers will enhance visibility, provide better guidance between lanes, shoulders and barrier and reduce the risk of collisions.

WSDOT will conduct a customer satisfaction survey before and after the installation of the lane markers.

Project Benefits

Improve visibility for drivers traveling over I-90 Snoqualmie Pass.

What is the project timeline?

  • Summer 2014 - contract to install LED lane markers and barrier reflectors begin.
  • October 2014enhanced delineation installed and operational.

Financial Information

Financial Data for PIN 509015N
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $994
Total $994

This project is  funded by a Federal Highway Administration Highway for Life grant and the gas tax.

How can I get more information?
Julie Heilman-Suarez, WSDOT project development engineer
Phone: 509-577-1703

Meagan Lott, WSDOT communications
Phone: 509-577-1618

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