In 1963, the Washington State Legislature commissioned a new state highway numbering system to ease confusion over similarly-numbered routes. The new system debuted in 1964, assigning State Route 522 (SR 522) to the Seattle–Bothell–North Bend highway, and State Route 202 (SR 202) to a proposed branch of the Stevens Pass Highway between Monroe and Bothell. By 1970, SR 522 was moved to the completed Bothell–Monroe highway, retaining the Seattle–Bothell portion, while SR 202 was designated to the remaining highway from Woodinville (east of Bothell) to North Bend.