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 route and enters Downtown Moses Lake. SR 17 skirts around Moses Lake and turns northwest onto an expressway after intersecting with Broadway Avenue, marked as the northern endpoint of SR 171.