The new diverging diamond interchange on I-90, designed to alleviate congestion at the Snoqualmie interchange, has fallen short of its intended purpose. Despite the ambitious plan to eliminate the notorious two-mile backup on westbound I-90 to westbound SR 18, drivers continue to experience delays, and a simple traffic sign may be the culprit. The issue lies in the lack of clear signage informing drivers that two lanes now exit to SR 18, leading to confusion and unnecessary congestion. The original sign, indicating an exit-only lane, has not been updated to reflect the new lane configuration, leaving drivers uncertain about their lane choices. This ambiguity results in drivers unnecessarily occupying the far-right lane, exacerbating the backup. The Washington Department of Transportation's reluctance to update the sign, citing it as outside the project's scope, only compounds the problem. Until drivers are aware of the dual exit lanes or the sign is corrected, the congestion will persist. This situation highlights the importance of accurate and visible signage in modern transportation infrastructure, as it directly impacts the driving experience and public frustration. It is a reminder that even the most innovative solutions can fail if not properly communicated to the public. As a traffic reporter, I find this case particularly intriguing, as it underscores the delicate balance between innovation and practical implementation in transportation planning. It also serves as a cautionary tale for policymakers and engineers, emphasizing the need for comprehensive communication strategies to ensure public understanding and cooperation.
