I-5 is Washington's busiest freeway

Built in the 1960s, Interstate 5 is Washington’s busiest freeway. Preserving this highway is an enormous undertaking that grows each year as the weather and billions of tires take a toll on pavement that is nearing the end of its useful life.

WSDOT is working to ensure that the interstate continues to perform at its best for as long as possible, preserving I-5 through regular inspections and preventative maintenance, along with months-long construction projects.