3.3.3. Multiple intersections
As the purpose of NeverStop is to reduce the average delay time
for each vehicle, therefore we should not only consider about the
local intersection, but also need to pay attention to the neighbor
four intersections, so as to achieve the congestion in a small area.
The phase model for multiple intersections is the same with single
intersections, which is presented in Fig. 3. Meanwhile, the delay
at each intersection is adjusted incrementally to coordinate with
the adjacent neighbor intersections to minimize stops in the direction
of dominant traffic flow. Fig. 5 illustrates the communication
principle between the integrated components.
So in the case of multiple intersections, there are a few differences:
after the delay time was calculated by the algorithm in
single intersection model, NeverStop will not set up the delay time
immediately. Instead, it asks for the information aboutthe neighbor
intersections from the central server. When the data was received
by the EBox, NeverStop can get a micro adjustment according to
the fuzzy control, and then get the accurate time that the current
phase should delay. For example, if the neighbor intersection is in
heavy jam, the delay time of current phase should be shorter. On
the contrary, if the neighbor intersections have no congestion, the time of green light can be increased accordingly. Fig. 6 describes
the relations between the classes.