According to the intersection status, there are several modes could be selected:
1.
Single intersection model: manage the traffic lights according to the traffic information of the local intersection.
2.
Multiple intersections mode: manage the traffic lights according to the local intersection and the traffic information of the neighborhood intersections.
3.
Special modes: the system has other configured modes. For example, when an ambulance or a fire truck comes, or even there is an accident, NeverStop should switch to corresponding mode to meet the individual requirement of accidental events.