1. Simulation of Traffic
at T-Junction

2. N S

3. Arrival Rate
at Junction
every
6.28 s
N S

4. Max cars
in Aisle 8
N S

5. Cross lane 3.6 s
Time to
Merge in Traffic 4 s
N S Time to

6. Arrival Rate
Southbound 55 5s Arrival Rate
Northbound 60 5s
N S

7. Time taken to
cross Junction 15 5 s
N S

8. GENERAL PURPOSE SIMULATION SYSTEM

9. ? What is GPSS?

10. t
v
Discrete Time Simulation
General Purpose
Programming Language

11. + = GPSS
Transaction Services

12. 1 2 3
1
Service
1
Transaction

13. 1 2 3
1
Service
1
Transaction

14. 1 2 3
1
Service
1
Transaction

15. 1 2 3
1
Service
1
Transaction

16. 1 2 3
1
Service
1
Transaction

17. GENERATE TERMINATE
Basic GPSS Blocks

18. QUEUE DEPART
Basic GPSS Blocks

19. SEIZE RELEASE
Basic GPSS Blocks

20. ADVANCE
Basic GPSS Blocks

21. Let’s Come Back to the Project

22. Creating
Create Simulation Ready

23. Simulation Starts
for
60,000 unit time
as 1 unit time = 1/100 second

24. Simulation in Action

26. Outcome from the
Simulation

27. 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

28. 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

29. Find the maximum number of cars queuing in the lane,
waiting to make a right turn.
FIRST Queue denotes queue of the cars waiting for a right turn.
Max cars waiting for a right turn are 8.

30. Need for Traffic Simulation
• To derive a plan for traffic control.
• Traffic Engineering
• Transportation Planning

31. Thank You