 Main Street leads west to 4th Street and another county road, ending up on IL 17 west of Joy.Finally, after 2.5 miles (4 km) of travel west on IL 17 to a point north of New Boston, a third north-south county road (designated as CR A in Rock Island County) takes Great River Road traffic to IL 92 opposite Muscatine, Iowa.The National Route reenters from Muscatine, following IL 92 east through the Quad Cities except for a detour onto County Road TT east of Illinois City.