 Merging with US 501, it becomes what is known as "15-501" ("Fifteen Five-o-one"), a concurrency that extends for across central North Carolina; US 15 also the dominant partner, using its mile markers along the route.After Laurinburg it goes north to Aberdeen, linking briefly with US 1 before continuing to Pinehurst.In Pinehurst, 15-501 goes through a rare roundabout, then continues north, through Carthage, back to US 1.