This document describes optimizing an urban traffic control system through data collection, determining phasing sequences and optimal cycle times, and setting offsets between intersections. It involves collecting traffic counts, travel times and queue lengths across 5 intersections (I-1 to I-5). Optimization determined the cycle time (120s), phase splits and offsets between intersections to provide progressive green bands and minimize delays. The proposed system uses smart cameras and microprocessors at each intersection, with fixed-point communications to a traffic control center for centralized optimization.

1. Urban Traffic Management
System
OPTIMIZATION OF
URBAN TRAFFIC CONTROL SYSTEM
Riza Atiq Abdullah bin O.K. Rahmat

2. Data collection
Phasing sequences
Optimum cycle time
and green time split Proposed automatic
Traffic control expert and intelligent urban
system traffic control
Offset determination
Setting up signal
controller on site

3. Step 1
Peak hours classified traffic count at all approaches
of the intersection under study.
16-hour traffic count at road links between
intersections under this study
Travel time survey along the study arterial route
Queue length and delay survey at all approaches of
the intersections under this study

4. I-5 I-1
I-4 I-3 I-2
Bangi
Kajang
Toll

5. Peak Hour Traffic Count
I-3 I-2 I-1
I-5 I-4

6. Step 2
I-5 I-1
I-4 I-3 I-2
Bangi
Kajang
Toll

7. Step 3: Optimazation

8. I-5 I-4 I-3 I-2 I-1
ϕ1 ϕ1 ϕ1 ϕ1 ϕ1
G=24 G=72 G=72 G=78 G=49
A=3 A=3 A=3 A=3 A=3
Rall=2 Rall=2 Rall=2 Rall=2 Rall=2
ϕ2 ϕ2 ϕ2 ϕ2 ϕ2
G=21 G=11 G=13 G=8 G=9
A=3 A=3 A=3 A=3 A=3
Rall=2 Rall=2 Rall=2 Rall=2 Rall=2
ϕ3 ϕ3 ϕ3 ϕ3 ϕ3
G=27 G=22 G=20 G=19 G=47
A=3 A=3 A=3 A=3 A=3
Rall=2 Rall=2 Rall=2 Rall=2 Rall=2
ϕ4
G=28
A=3
Rall=2

9. Step 4
3000
2500
2000
Distance (m)
1500
1000
500
0
0 100 200 300 400 500 600
Time (s)
Uncoordinated Signalised Intersection

10. Step 4
3000
2500
2000
Distance (m)
Bandwidth
1500
1000
500
0
0 100 200 300 400 500 600
Time (s)
Coordinated signalised intersection, providing progressive flow

11. Step 4: calculation of offset
Microsoft Excel
Worksheet

12. Step 4 I-5 I-4 I-3 I-2
I-1
Bangi
Kajang
Toll
Relative Offset = 24, Relative Offset = 6, Relative Offset = 0, Absolute Offset =0
Absolute Offset =23+24 = 47 Absolute Offset =6-6 = 0 0
ϕ 2= 0 ϕ 3=
0
28+2+3 ϕ 3= 47+2+3
27+2+3 ϕ 3=
22+2+3
47 ϕ 1=
Cy/Time
Cy/Time
=120s
49+2+3
=120s Cy/Time
=120s
ϕ 2= ϕ 2=
21+2+3 11+2+3
ϕ 1= ϕ 1= ϕ 2=
24+2+3 72+2+3 9+2+3
Relative Offset = 23, Absolute Offset =0+23=23 Relative Offset = -6, Absolute Offset =-6
ϕ 3=
0 20+2+3 0
ϕ 2= 23
6
13+2+3 ϕ 3=
19+2+3
Cy/Time ϕ 1=
Cy/Time
=120s 78+2+3
=120s
ϕ 2=
8+2+3
ϕ 1=
72+2+3

13. Smart Camera
Microprocessor
M M
P M M
P
P
P
Fixed-point to fixed-point communications
TRAFFIC CONTROL CENTRE