The Washington State Department of Transportation (WSDOT) opened the state’s second diverging diamond interchange early Friday, July 25, improving traffic flow and safety at the busy I-90/SR 18 interchange near Snoqualmie.
The new configuration opened following an eight-day, 24-hour closure of SR 18 under the I-90 bridges to complete construction of the northern end and transition vehicles into the new traffic pattern.
How the Diverging Diamond Works…