The tunnel will be closed for up to five nights to texture the road to improve traction, says the Washington State Department of Transportation.

SEATTLE - The Washington State Department of Transportation (WSDOT) will begin a $1.5 million project to improve traction in the State Route 99 tunnels starting Monday, Aug. 18.

Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, Sept. 5, to 6 a.m. Saturday, Sept. 6, ...