State Route 518 is more than just a highway. As the main route to one of the busiest airports in the country, it connects Western Washington to the world. Locally, it’s a key pipeline for commuters and international commerce. [caption id="attachment_133504" align="aligncenter" width="490"] Nearly 130,000 vehicles drive on this stretch of SR 518 – between I-5 and the exit to the airport – everyday.[/caption] Stretching from SR 509 in Burien to the I-5/I-405 interchange in Tukwila, this 3.5-mile highway helps move a lot of people. In 2017, between 71,000 and 131,000 vehicles used the corridor every day. With the considerable growth happening in nearby communities and at Sea-Tac International Airport, those numbers – and the delays that go along with them – are expected to keep going up. [caption id="attachment_133502" align="aligncenter" width="490"] This map shows the SR 518 corridor – the subject of this study.[/caption] That’s why WSDOT – with the help of our local city partners, King County Metro, Port of Seattle and Sound Transit – is conducting a planning study to develop solutions that will keep traffic moving on SR 518.  Before WSDOT can develop solutions, they want to hear from YOU – the people who use SR 518. Your input could shape the future of this highway.

Click here to provide feedback!

To make sure your feedback is heard, complete this quick online survey: then share it with friends and family who also travel on this corridor. WSDOT wants to hear from all users of the highway. The survey should take less than five minutes. You can also visit the study website for more information, and stay in the know by signing up for email updates at]]>