SR 520, or State Route 520, is a major highway in the state of Washington. It connects the city of Seattle to Redmond and provides access to various communities and recreational areas. The route includes the SR 520 Floating Bridge, which spans Lake Washington and is one of the longest floating bridges in the world. The highway serves as a vital transportation corridor, facilitating both commuter and commercial traffic. It features multiple lanes, interchanges, and connections to other major routes, enhancing mobility in the Puget Sound region. Improvements and expansions have been made over the years to accommodate growing traffic demands.