The Sunset Highway, one of Washington's earliest cross-state highways, offered the first vehicular crossing of the Cascade Mountains, which split the state in two pretty much up to that point. 
The highway mostly followed a Native trail that had been turned into a wagon road when it was opened in 1915. Throughout the years, the Sunset Highway saw a series of name changes, starting as State Road No. 2, then becoming the Sunset Highway, Main State Highway No. 2, U.S. 10, and Interstate 90, sometimes sequentially and sometimes concurrently. 
The highway, which carries traffic across the busiest mountain crossing in the state, is the main east-west route in the Evergreen State.
Listen now to learn more about the fascinating history of this Evergreen State highway!

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Thank you for listening to another episode of the History of the Evergreen State Podcast!