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July 2014

Turning over a New Leaf: Improving a Cloverleaf Interchange

The reconstruction replaced two cloverleaf ramps with flyover ramps, upgraded ramps, and improved connections to and from Interstate 5, State Route 18, and State Route 161.

When the Interstate 5 (I-5)/State Route 18 (SR 18) interchange in Federal Way, Washington, opened to traffic in the early 1960s, its innovative cloverleaf design was unveiled as “state of the art” in freeway design. As years passed, the area’s commercial and residential growth resulted in heavy traffic volumes. Increased traffic density, coupled with short weaving segments, forced drivers to often perform abrupt weaving and merging maneuvers on and off the freeway, causing severe congestion and potential for highway collisions. In addition, the existing loop ramps were considered to be substandard based on current design standards and two of the four ramps were categorized as high-accident locations.

Launching a Much-Needed Transit Line in King County

RapidRide travels several of the busiest transit corridors in King County.

Within the last 20 years, Washington State’s greatest population growth was in King County and this progression is expected to continue in the next 30 years. As a result, there is an increasing need for reliable and affordable transportation during all hours of the day and long into the night. To meet this demand, the RapidRide program was launched to provide residents with a frequent and convenient transit system. King County Metro Transit recently hosted a public celebration at The Landing in Renton to commemorate the opening of the new RapidRide F Line for riders traveling between Burien, SeaTac, Tukwila, and Renton. The sixth line in the program officially began service on Saturday, 7 June.