The roadway expands to four lanes and turns north at Pioneer Way, where I-90 Business leaves the concurrency and travels into Downtown Moses Lake. SR 17 heads around Moses Lake and turn northwest onto a limited-access highway after an intersection with Broadway Avenue, signed as the northern terminus of SR 171.
The highway is widened to four lanes and makes a turn at Pioneer Way, where I-90 Business exits the shared path and enters Downtown Moses Lake. SR 17 circumvents Moses Lake and turns northwest onto an expressway after intersecting with Broadway Avenue, signifying its northern terminus.