The name is absent

CHAPTER 5. SIMULATION RESULTS
the beginning to the end of the Wetstraat. The traffic density is too high for this
controller. The road users cannot keep the predefined speed, and this is why the
aim of the green wave cannot be fulfilled.

For the highest traffic density at 7am a big queue of road users is formed at the
beginning of the Wetstraat. Sometimes there is only one road user waiting at a
red traffic light on a side-road. When it gets green, the light stays green for 25
seconds.

During the average traffic density at 6am the controller is much better. The flow
of cars moving on the Wetstraat is divided by the red lights. The last road users
getting green can keep up the speed and will get green at the next traffic light. The
optim controller works successfully for this traffic density.

At 7am there are 5270 cars counted at the Wetstraat and at 6am there are only
2933 cars counted. This is about 55% of the traffic density at 7am.

For a low traffic density at midnight the cars only have to wait on the Wetstraat if
the first traffic light is red, otherwise, the cars on the Wetstraat do not have to stop.

5.3.3 Request controller

The sotl-request controller works best for a high θ. With a high θ, the road users
at the side-roads have to wait longer, and the priority goes to the road users on
the Wetstraat (because the traffic density on the Wetstraat is much higher). The
green time on the side-roads is only a fraction (about 10%) of the green time on
the Wetstraat.

The results show that this controller can manage the traffic density at 7am.
Almost all traffic lights at the Wetstraat are green and sometimes one or two traffic
lights turn red on the Wetstraat. This gives a very good result.

At lower traffic densities, the red lights on the Wetstraat stay red for a longer
period of time. This is because the traffic light turns green when it is requested
by waiting road users in front of those traffic lights. In this case, the road users
on the Wetstraat have to stop more often and for a longer period of time as the θ
becomes bigger. For lower traffic densities, a lower θ gets better results, because
the roadusers have to wait for a shorter period of time to get a green light. With
a very low θ (θ = 5) the road users will get green almost immediately, but this

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