Simulation of traffic at T-Junction
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Transcript of Simulation of traffic at T-Junction
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Simulation of Traffic
at T-Junction
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N S
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N S
Arrival Rate at Junction
every
6.28 s
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N S
Max carsin Aisle 8
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N STime toCross lane 3.6 s
Time toMerge in Traffic 4 s
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N S
Arrival RateSouthbound 55 5sArrival Rate
Northbound 60 5s
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N S
Time taken tocross Junction 15 5 s
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GENERAL PURPOSE SIMULATION SYSTEM
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? What is GPSS?
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t
v
Discrete Time Simulation General Purpose Programming Language
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+ = G P S S
ServicesTransaction
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21 3
1Service
1Transaction
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21 3
1Service
1Transaction
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21 3
1Service
1Transaction
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21 3
1Service
1Transaction
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21 3
1Service
1Transaction
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GENERATE TERMINATE
Basic GPSS Blocks
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QUEUE DEPART
Basic GPSS Blocks
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SEIZE RELEASE
Basic GPSS Blocks
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ADVANCE
Basic GPSS Blocks
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Let’s Come Back to the Project
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Creating
Create Simulation Ready
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Simulation Starts
for
60,000 unit time
as 1 unit time = 1/100 second
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Simulation in Action
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Outcome from the Simulation
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Determine the transit time of northbound cars turning
at the T-Junction.
From the TRANSIT table we can see that: Mean Time = 4297.153 Unit Time Time (In Second) = 4297.153/100 = 42.97153 seconds
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Tabulate the actual Erlang service times.
Crossing Time (Mean) = 359.996/100 = 3.59996 Crossing Time (S.D.) = 37.999/100 = 0.37999
Merge Time (Mean) = 400.181/100 = 4.00181 Merge Time (S.D.) = 44.992/100 = 0.44992
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Find the maximum number of cars queuing in the lane,
waiting to make a right turn.
Max cars waiting for a right turn are 8.
FIRST Queue denotes queue of the cars waiting for a right turn.
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Need for Traffic Simulation• To derive a plan for traffic control.
• Traffic Engineering
• Transportation Planning
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Thank You