1 © PTV-AP 2010 www.ptvap.co m Signal Optimisation in VISSIM Julian Laufer
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May 28, 2015
The VISSIG Optimisation Process within VISSIM is outlined, including steps and actions for download.
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1© PTV-AP 2010
www.ptvap.com
Signal Optimisation in VISSIM
Julian Laufer
2© PTV-AP 2010
Signal Optimisation within VISSIM> Automatic adjustment of phase splits to single intersection
> Master signal within subsystem
> Repeated simulations of the whole network
> All controllers switched off except a single one
> simulations continue as long as changes of the stage green times either:
> increase the flow (total volume) or
> reduce the average vehicle delay
> stage timings with the best result of BOTH highest flow AND lowest average vehicle delay are saved in the SIG file at the end of the optimisation.
3© PTV-AP 2010
Terminology
> Let’s use PHASES and STAGES interchangeably
4© PTV-AP 2010
Requirements> This functionality requires the VISSIG add-on!
> VISSIG Requirements:
1. signal groups,
2. an intergreen matrix,
3. stages and
4. a stage based signal program
> VISSIM Requirements :
1. signal heads,
2. a surrounding node and
3. adjacent nodes
Nodes
5© PTV-AP 2010
Calculation> Simulate to determine delay per signal group
> Find SignalGroup with best delay
> Take time off from this movement
> Find SG with worst delay
> Give time to this movement
> This process is BALANCING!
> Iterative Loop until...
> increase in 10% traffic solutions and
> mean delay decreased for all movements.
6© PTV-AP 2010
VISSIM 5.30: Signal Optimisation
7© PTV-AP 2010
VISSIG Interface
Standard package in VISSIM
8© PTV-AP 2010
VISSIG Interface
9© PTV-AP 2010
VISSIG Interface
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VISSIG Interface
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VISSIG Interface
Insert all stages to Program at once!
12© PTV-AP 2010
VISSIG Interface
Automatic creation of VAP pua files!
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VISSIG Interface
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VISSIG Interface
Staged based solutions – yet to confirm optimisation
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VISSIG Interface
Shoulder Cycle
Shoulder Cycle
Peak Hour Cycle
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VISSIG Interface
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VISSIG Interface - Outputs
Demand to impact on Phase Times
No Change implies spare capacity.Different demands and use of capacity -> signal splits will change
18© PTV-AP 2010
> How to best utilise the intersection for a future year application.
> Eg Without developments 2021 / with developments in 2031
> Current process determines splits within cycle
> Yet to provide cycle time optimisation
Note Forthcoming> Signal Offset Optimisation
> Automated Signal Optimisation for each period in Daily profile
> More to come in 2011
Applications
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Also..
Don‘t forget about Signal Control in VISUM
•Signal Optimisation
•Signal Offsets
20© PTV-AP 2010
Time-Space Offset Diagrams
No Coordination Present Yet!!!
Platoons Don’t Meet at Signals!
Resolution: Offset Westbound Cluster
Good Coordination Present!!!
21© PTV-AP 2010
Signal Optimisation
VISUM Junction Editor
Same file format as VISSIM (sig files) Splits are optimised!
22© PTV-AP 2010
www.ptvap.com
Signal Optimisation in VISSIM
Julian Laufer
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