1964 state highway renumbering (Washington)
Highway renumbering in Washington / From Wikipedia, the free encyclopedia
The 1964 state highway renumbering was a reorganization of state highways in the U.S. state of Washington. The new system, based on sign routes (SR, later changed to state routes), replaced the primary and secondary highway system implemented in 1937. It was first signed in January 1964 and codified into the Revised Code of Washington in 1970.
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