WSDOT Explains How Shoulder Driving Will Ease I-405 Congestion reports, “The state has promised hard-shoulder driving on a stretch of I-405 to ease the daily congestion created by the express toll lanes,” and “It is now one step closer to implementing that” with the award of the project construction contract. A WSDOT representative explains to the website’s readers how shoulder driving will ease congestion problems for general purpose lane commuters.