Well, I was wrong, according to this:
"The caller was not required to stay in the area and wait for emergency workers or the N.C. Highway Patrol to arrive, said Robbie Stone, emergency services assistant director."
Also, it was not just the State Patrol that went to the scene after the original call; it was EMS, Nash County Sheriff, and the NC Highway Patrol.
While the caller may not have been required to stay, any responsible human being would have done so. Of course, I will be labeled a racist for saying that I suppose.