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Application of Computer Simulation to the Design of a Traffic Signal Timer

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Bangalore City Traffic Police. Need for Simulation ... Bangalore City Traffic Police. Relations Machine and Buffer. Machine Junction 1 ... – PowerPoint PPT presentation

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Title: Application of Computer Simulation to the Design of a Traffic Signal Timer

1
Application of Computer Simulation to the Design
of a Traffic Signal Timer
BANGALORE CITY TRAFFIC POLICE
2
Introduction
• Objective - To reduce the Average Waiting Time of
each approaching vehicle at the traffic signals.
• Package Witness 2003 Simulation Software.

3
Need for Simulation
• Provides option of trying out ideas at a fraction
of cost.
• Facilitates fixation of signal waiting time based
on scientific analysis.
• Facilitates adoption of different cycle time
during different parts of a day.

4
Methodology
• Identify different types of vehicles using
• Data Collection and Analysis.
• Use Simulation Package for getting a real time
assessment of the situation.

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7
Data Analysis
• Objective
• To find out the exit percentages of the vehicles
from each road according to the available exit
options.
• Modus Operandi
• No. of vehicles flowing out of each road.
• Sum total and average.
• Average no. of vehicles exit options.
• Calculate the ratio and the percentages.

8
• Exit options are 3 i.e., to roads 2, 3, 4.
• Average of the above - 4244
• Average figures from three days data
• Avg flow to road 2 241 5.60
• Avg flow to road 3 2577 60.5
• Avg flow to road 2 1438 33.9

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Model Development
• Assumptions
• Length of road 1 100m
• Length of road 2 100m
• Length of road 3 50m
• Length of road 4 150m
• Length of road 5 100m
• Length of road 6 50m
• Length of road 7 100m
• Average Speed of vehicles on each of the road
36km/h or 10m/s
• Inter arrival times of vehicles on all the roads
1 second
• Vehicles enter at Roads 1, 2(a), 3(a), 5 and
6(a).
• Attribute (Length in parts) for conveyors

11
Representations
• Machine Traffic Signal
• Parts Vehicles
• Buffer Parts accumulate when there is a red (
machine state is idle)
• Timer Average Waiting Times

12
Calculation Index Time
• Length of the road 100m
• Speed of the vehicle 10 m/s
• Time taken to cross the road 10 seconds
• Length in parts of Conveyor 1(Road 1) is taken as
50
• Index time 10/50 0.2 seconds

13
Relations Machine and Buffer
• Machine Junction 1
• J1 Road 1 (58 secs)
• J1(a) Roads 1 and 3(a) (50 secs)
• (50 secs)
• J1(c) Roads 2(a) and 4(a) (35 secs)
• Junction 2
• J2 Road 5 (43 secs)
• (40 secs)
• J2(c) Roads 4 and 6(a) (80 secs).
• Buffer Relation An Example
• B12 Holds parts that flow from road 1 to road 2

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Reduction IAT - 1sec
24
FINAL TIMINGS
25
Thank You