Majalah Ilmiah UNIKOM

Vol.8, No. 2

212

H a l a m a n

Muhammad Aria

location of them: the north input-links, the

west input links, the east input links and the

south input links. We give the traffic

generation plan to each input-link group, so

all input-links in a group have the same

plan. Cars are generated according to the

given plan of a input link and inserted into

the link. In the development of the traffic

simulator, the following assumptions are

made :

i. the intersection is four way junction with

traffic coming from the north, west, east

and south directions

ii. when traffic from the north and south

moves, traffic from the west and east

stops, and viceversa

iii. only passenger cars exist and there is no

obstruction to traffic flow such as cross-

walks.

iv. left turning traffic and right turning traffic

are 20% of the traffic of a link respec-

tively

In this simulation we use the following head-

way equation:

SIMULATION RESULTS AND DISCUSSION

Performance of Type 2 Fuzzy Logic System

(T2FL) is investigated using simulation stud-

ies. The developed controller was compared

with Type-1 Fuzzy Logic System (T1FL) and

Fixed Time Controller. Simulation was per-

formed under 18 situations.

1. Case that the traffics of all input links

are same :

(a) 900 cars/h

(b) 1100 cars/h

(c) 1300 cars/h

(d) 1500 cars/h

(e) 1700 cars/h

(f) 1800 cars/h

2. Case that the traffic changes every 15

minutes

a. case of light traffic (cars/h)

b. case of normal traffic (cars/h)

RULE

INPUTS

OUTPUTS

EXTEND

URGENCY

DECISION

1

Z

Z

No

2

Z

S

Yes

3

Z

M

Yes

4

Z

L

Yes

5

Z

VL

Yes

6

S

Z

No

7

S

S

No

8

S

M

Yes

9

S

L

Yes

10

S

VL

Yes

11

M

Z

No

12

M

S

No

13

M

M

No

14

M

L

Yes

15

M

VL

Yes

16

L

Z

No

17

L

S

No

18

L

M

No

19

L

L

No

20

L

VL

Yes

21

VL

Z

No

22

VL

S

No

23

VL

M

No

Table 3. Fuzzy Rules of the Decision Module

(19)

Time

0 – 15

15 –

30

30 –

45

45 –

60

North

1000

1000

900

1000

West

1200

1100

1100

1000

East

800

1000

1000

1100

South

900

1000

1100

1200

Time

0 – 15

15 – 30

30 –

45

45 –

60

North

1300

1400

1300

1300

West

1400

1400

1500

1300

East

1400

1300

1400

1300

South

1400

1300

1400

1300