Transcript
Simulation of Traffic
at T-Junction
N S
N S
Arrival Rate at Junction
every
6.28 s
N S
Max carsin Aisle 8
N STime toCross lane 3.6 s
Time toMerge in Traffic 4 s
N S
Arrival RateSouthbound 55 5sArrival Rate
Northbound 60 5s
N S
Time taken tocross Junction 15 5 s
GENERAL PURPOSE SIMULATION SYSTEM
? What is GPSS?
t
v
Discrete Time Simulation General Purpose Programming Language
+ = G P S S
ServicesTransaction
21 3
1Service
1Transaction
21 3
1Service
1Transaction
21 3
1Service
1Transaction
21 3
1Service
1Transaction
21 3
1Service
1Transaction
GENERATE TERMINATE
Basic GPSS Blocks
QUEUE DEPART
Basic GPSS Blocks
SEIZE RELEASE
Basic GPSS Blocks
ADVANCE
Basic GPSS Blocks
Let’s Come Back to the Project
Creating
Create Simulation Ready
Simulation Starts
for
60,000 unit time
as 1 unit time = 1/100 second
Simulation in Action
Outcome from the Simulation
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
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
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.
Need for Traffic Simulation• To derive a plan for traffic control.
• Traffic Engineering
• Transportation Planning
Thank You
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