Term paper based on case study And Implementation of a fuzzy application Fuzzy Traffic Control System


Simulation Results and Discussions



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FuzzyTrafficControlSystem

Simulation Results and Discussions:
In order to compare the results, 3 types of performance indices were used: (i) flow density 
average, (ii) link overflow and (iii) delay time average.
(i) Flow density average
:
The average total number of Passenger Car Unit (pcu) in all these 4 
intersections at 1 second is called Flow density average. 
(ii) Link overflow:
 
It indicates the number times and number of links that are in overflow 
condition. 
(ii) Daily time average:
 
This is the average pcu waiting time at every link before each is allowed 
to cross the intersection. 
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Figure 14: Performance index of flow density average [3]
In order to compare it considered, flow density average as the most important performance 
indicator, followed by link overflow and delay time average. This Figure 14 shows the results of 
the 3 traffic controllers based on three traffic volumes: low, high and real.
As mentioned before if the value of the flow density average is lower the performance of the 
controller will be better. From this graph we can observe in the first simulation, three traffic 
controllers has been tested under low traffic volume and can not find any significant difference, 
but the fuzzy controller showed slightly better performance. In the second simulation exercise we 
can see the improvement of the fuzzy controller in the flow density average compared with other 
two controllers under high traffic volume. The third simulation was done under actual traffic 
condition when traffic condition was extremely bad and they found the result showing in 
following table.
Table 7: Comparison of Simulation Results based on Actual Traffic Conditions of the Junction 
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In
Table 7 we can observe that in terms of Link Overflow in all four intersections fuzzy traffic 
controller performed better than other two controllers. It also performed better, which is more 
than 50% over other two controllers in terms of Flow Density Average. In case of high traffic 
volume, the fuzzy traffic controller did not performed better than other two controllers, for that 
reason we can see here the Delay Time Average of the fuzzy controller is not better than other 
two controllers. But the difference is very small. So, we can conclude that overall fuzzy 
controller shows better performance over other two controllers.

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