The Washington State Department of Transportation admits it’s difficult to sometimes see the lane markings on I-90 over Snoqualmie Pass.

According to WSDOT, the pavement markings are made with glass beads, making them bright in headlights. But the rain reduces reflectivity so the lines are not as bright and visible.

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WSDOT also installed Raised Recessed Pavement Markers on I-90 from North Bend to Cle Elum. Unfortunately, those markers are less visible when the slots fill with rain or snow.

In 2014, WSDOT installed over 4,600 LED pavement markers along a 7-mile stretch near the summit in both directions. Since they are solar powered, the lights may not last throughout the night.

“We have tried many alternative striping products that are very expensive and or time consuming to apply. If we find something new, we are willing to test it, but we have not found a product durable enough to withstand the traffic and snow removal equipment.”

Until the best, most cost-effective solution is found, WSDOT will reapply paint at least twice a year and when needed as conditions allow.