KERNERSVILLE, N.C. (WGHP) — A tractor-trailer jackknifed on U.S. 421 and ended up blocking traffic on Saturday morning. According to the North Carolina Department of Transportation, the incident began at 10:40 a.m. in the southbound lanes of U.S. 421, near Exit 221 and Macy Grove Road. NCDOT repor ts the scene was cleared as of 11:45 [...] ...read more read less