3.3.1. Phase model
There are at least four phases at each intersection. When one
phase is running, the other phases are disabled automatically.
Please note the phase model is only for demonstration that it can be
extended to more phases for the real occasions. In order to maintain
the ubiquitous and general, we use a four phase model in this
paper, which are presented in Fig. 3.
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.