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. The highway is generally four lanes wide with a landscaped median or center turn lane in some areas. The entire route is designated as part of the National Highway System, a network of roads identified as important to the national economy, defense, and mobility. The corridor is also served by buses operated by Everett Transit and Community Transit, including the Swift Green Line—a bus rapid transit route that began service in 2019 and runs every 10–20 minutes between stations on SR 527 with transit signal priority and other features.