 SR 503 enters Woodland and turns south onto Goerig Street before ending at a diamond interchange with I-5 near the confluence of the Lewis and Columbia rivers.Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume.This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year.