Interstate 90 at Snoqualmie Pass reopened Friday afternoon after closing both directions due to multiple spin outs, according to WSDOT.
Compact snow slush and ice is on the roadway.
Chains are required on all vehicles that are not all-wheel drive and no oversize vehicles are allowed.
WSDOT warned travelers they can expect to add 45 minutes to an hour to their travel time as they cross the pass.
This story has been updated.