Design andAnalysis ofaTwoStage Traffic Light System Using Fuzzy Logic



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design and analysis of a two stage traffic light system using fuzzy

Extension time decision module
Extension time decision module (ETDM),calculate green light 
time i.e., extension time of the phase which has higher urgency can be 
calculated according to the number of vehicles as shown in Figure 4
.
There are two input variables namely 
Queue-Lane-1, Queue-Lane-2
and 
one output variable 
Extension-Time
. The input variable 
Queue-Lane-
1
count the number of vehicles of lane 1 and input variable 
Queue-Lane-
2
count number of vehicles of other side i.e., lane 2 of red light phase 
which has big traffic urgency. The output variable 
Extension-Time
is 
the extension time of current green light phase. Therefore for instance 
in the case of Phase 1, ETDM will determine the green light duration 
i.e., extension time (E1) by processing the queue length of the Lane 
EL1 of the Road direction E and Lane WL1 of the Road direction W. 
Similarly, for phase 2, ETDM will determine the extension time (E2) 
by processing the queue length of the Lane EL2 of the Road direction E 
and Lane WL2 of the Road direction W and so on.

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