 The highways connect SR 527 to Downtown Everett, the Everett Mall area, and the Boeing Assembly Plant, respectively.SR 527 is maintained by the Washington State Department of Transportation (WSDOT), which conducts an annual survey on state highways to measure traffic volume in terms of average annual daily traffic.Average traffic volumes on the highway in 2016 ranged from a minimum of 19,000 vehicles in northern Mill Creek to a maximum of 54,000 vehicles at the I-405 interchange.