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.
We hope you loved this article. If so, please consider subscribing or donating. The Urbanist is a 501(c)(4) nonprofit that depends on donations from readers like you.