The Washington State Department of Transportation has announced that they are planning on introducing the first Diverging Diamond Intersection (DDI) on I-5 at Marvin Road in Lacey. The DDI was first introduced in 2009 in Springfield, MO and helps improve traffic flow through complex interchanges by minimizing traffic signal phases, shortening wait times, and improving traffic throughput. In addition, this intersection design cuts in half the number of potential conflict points while purportedly improving safety for pedestrians, cyclists, and other road users.

Article Author
Gordon Werner

Gordon is a native New Yorker who wisely chose to leave the Northeast in the early 1990s. A past resident of Belltown, and Queen Anne, he currently calls First Hill home. He is a board member of the First Hill Improvement Association (FHIA) as well as the FHIA Transportation Committee Chair and is constantly looking for ways to improve transportation up the hill.