CHAPTER 6. CONCLUSION
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The platoon controller for low traffic density reduces the ATWT with 92% and
eliminates the waiting queues.
6.2.3 Scenario 3: Wetstraat
The simulations of the Wetstraat are based on the real traffic flow in the Wet-
straat. The spawn frequencies at the beginning of the Wetstraat are counted by the
Ministry of the Brussels-Capital region. The destination of cars at every junction
are approached by counting the destination of cars coming from every direction
at every junction. The spawn and destination frequencies of all edge-nodes are
calculated based on those counts.
The self-organizing traffic light controllers are simulated for every traffic den-
sity. The marching and optim controller are modified to approach the green times
of the traffic lights in the Wetstraat.
The performance of the self-organizing traffic lights depends on the decision vari-
ables of the algorithms. Different values are tested for those decision variables
and the values which perform best have been selected. Those values depend on
the topology of the infrastructure and on the traffic density at each junction. The
self-organizing traffic light controllers can be modified to detect the traffic density
and select the best values for those decision variables. The simulation results show
that the traffic density is growing monotonicly with the value of θ to obtain the
best ATWT results. Further simulations for those modified traffic light controllers
are needed.
The simulation results are given for fixed decision variables and are compared
with the optim controller for all traffic densities.
The simulations for the Wetstraat give similar results as obtained in the previ-
ous scenarios. The green wave algorithm is a good algorithm which optimizes the
traffic flow on the Wetstraat. This gives good results, but the platoon controller
has better results for all traffic densities. For the traffic densities at 0, 1, 2, 5, 6,
20, 21, 23 hour, platoon reduces the average total waiting time with 59-67%.
The simulation results show that the optim controller has a queue of 1186 road