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Page 9 of 14Majalah Ilmiah UNIKOM
Vol.8, No. 2
211
H a l a m a n
Muhammad Aria
which translates into the possibility of ex-
tending the green phase. The membership
function of these inputs are the same as
NextPhase Module
Figure 6 and Figure 7.
Extend
of 5 membership functions. This member-
Urgency
membership function as shown in Figure 9.
In this module, 17 rules have been devel-
oped as given in Table 2.
Fuzzy Logic Decision Module
The Decision Module makes the decision
whether to switch to the green phase. Its
NextPhase
GreenPhaseUr-
gencyExtend
UrgencyExtend
pared at every interval and the consequent
determines whether to change the phase or
extend the green signal. In this case we use
Yes
No
Urgency
Extend
tion for the next phase has heavier traffic
than the current green phase, and thus the
output will change the phase rather than
extend the green signal at the current
Ur-
gencyExtend
presented in Figure 10 and Figure 11.
Decision Module
given as in Table 3. In all the three modules
of the fuzzy controller, the Sugeno inference
method are used in the controllers.
DESIGN OF TRAFFIC SIMULATOR
A simulator for intersection group has
been developed to test the developed traffic
controller. The simulated intersection model
consists of nine intersections. Each intersec-
tion is connected with its neighborhoods in
the four directions. Each link is two way and
have capacity 250 cars. Figure 12. shows
the simulated intersection group.
The intersection group are divided into
four groups input-links according to the
RULE
INPUTS
OUTPUTS
Queue
Num
FrontNum
Urgency
1
Z
Z
2
S
S
S
3
S
M
S
4
S
L
S
5
S
VL
S
6
M
S
L
7
M
M
M
8
M
L
S
9
M
VL
S
10
L
S
VL
11
L
M
L
12
L
L
M
13
L
VL
S
14
VL
S
VL
15
VL
M
VL
16
VL
L
L
17
VL
VL
M
Table 2. Fuzzy Rules of
Figure 10. Membership functions
for Urgency
Figure 11. Membership functions for Extend