Each source generates traffic at a constant rate of 30 cars per
minute. The additional burst is either 10 cars per minute (large
burst) or 5 cars per minute (small burst). Fig. 10 plots the output
rate when the destination link has d = 300s. Congestion collapse
occurs as soon as the output link density goes above its B
∗
l value,
which takes place about 10 minutes into the simulation. The output
rate continues to decay as the buffer of the output link continues
to operate in the congestion region. However if signaling is used,
then the flow into the output link is controlled by metering the cars
flowing in from the two input links. As a result, the output link
continues to operate at its maximum capacity of 60 cars per minute.
Similarly, Fig.11 plots the output rate when the destination link has
d = 450s. The behavior is very similar to when d = 300s, with
the difference being that when d = 450s, congestion sets in after a
larger delay, because of the larger buffer on the destination link.