1964 highway renumbering (Washington)
 
1964 state highway renumbering
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| Highway names | |
|---|---|
| Interstates: | Interstate X (I-X) |
| US Highways: | U.S. Route X (US X) |
| State: | State Route X (SR x) |
| System links | |
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.
The former numbering system of primary and secondary state highways, using lettered suffixes and un-named branches, created confusion for motorists as the system expanded. The system also ignored, or conflicted with, the federal highway system and the then-developing Interstate Highway System.
In 1963, the Washington State Legislature passed a law authorizing the creation of a new state highway numbering system under the direction of the Washington State Highway Commission. The law came in response to confusion experienced by tourists visiting during the 1962 World's Fair, held in Seattle. The highway commission approved its numbering plan in June 1963, using even numbers for east–west routes and odd numbers for north–south routes; federal highways, including Interstate highways, would retain their designations and be incorporated into the system.
The new signs were posted in January 1964, at a cost of $115,000.
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