sentences:  SR 548 was created in 1991 from Peace Portal Drive, Blaine Road, and Grandview Road between Ferndale and Blaine in the last major revision of the highway.In 2010, WSDOT improved the I-5 interchange in Blaine at a cost of $13.2 million by converting it to a dogbone interchange using two new roundabouts.A roundabout was constructed at the Cherry Point Refinery in 2018.