There are permanent zipper merge opportunities on state highways and city streets. “If you had some kind of signage that was very explicit, so that you said something like, ‘zipper merge, use both ...

Zipper merging reduces backups by up to 50% during lane closures statewide. The method uses both lanes fully and merges vehicles alternately at lane ends. WSDOT urges drivers to plan, maintain speed ...

Have you seen the road sign “Right lane closed ahead, merge left,” but while you move to the left lane, other cars fly by you in the right lane? Then they duck into the left lane ahead of the cars in ...

Summer is prime time for construction in Washington state. With hundreds of construction projects scheduled across the state this summer, routes are altered on many cross-state trips. These projects ...