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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.
  • Arena Cubbon Road and Brigade Road junctions.

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
    adopted junctions.
  • 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
Data Analysis From Road 1
  • Exit options are 3 i.e., to roads 2, 3, 4.
  • To road 2 4200
  • To road 3 4611
  • To road 4 3921
  • 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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10
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
  • Conveyor Road
  • 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
  • For Road 1
  • 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)
  • J1(b) Road 2(a)
  • (50 secs)
  • J1(c) Roads 2(a) and 4(a) (35 secs)
  • Junction 2
  • J2 Road 5 (43 secs)
  • J2(a) Road 4
  • (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
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