A traffic signal has been installed for one-lane traffic control at the breach area on NC12. Photo: C. Leinbach By Connie Leinbach The North Carolina Department of Transportation at 5 p.m. Friday reopened N.C.12 on the north end of Ocracoke and resumed service on the Hatteras-Ocracoke ferry. Jamie Kritzer, assistant director of communications for NCDOT,…