PTV Vissig Optimisation Share
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The document discusses signal optimization in VISSIM software. It describes how VISSIM can automatically adjust phase splits at a single intersection by running repeated simulations with all controllers turned off except one. The green times are optimized to increase total traffic flow and reduce average vehicle delay. The process balances times between signal groups with the best and worst delays in an iterative loop until certain criteria are met. Signal offset optimization is also briefly mentioned.
PTV Vissig Optimisation Share
- 1. Signal Optimisation in VISSIM Julian Laufer
- 2. 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. Terminology Let’s use PHASES and STAGES interchangeably
- 4. Requirements This functionality requires the VISSIG add-on! VISSIG Requirements: signal groups, an intergreen matrix, stages and a stage based signal program VISSIM Requirements : signal heads, a surrounding node and adjacent nodes Nodes
- 5. 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. VISSIM 5.30: Signal Optimisation
- 7. VISSIG Interface Standard package in VISSIM
- 10. VISSIG Interface
- 11. VISSIG Interface Insert all stages to Program at once!
- 12. VISSIG Interface Automatic creation of VAP pua files!
- 13. VISSIG Interface
- 14. VISSIG Interface Staged based solutions – yet to confirm optimisation
- 15. VISSIG Interface Shoulder Cycle Shoulder Cycle Peak Hour Cycle
- 16. VISSIG Interface
- 17. 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. 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
- 19. Also.. Don‘t forget about Signal Control in VISUM Signal Optimisation Signal Offsets
- 20. Time-Space Offset Diagrams No Coordination Present Yet!!! Platoons Don’t Meet at Signals! Resolution: Offset Westbound Cluster Good Coordination Present!!!
- 21. Signal Optimisation Splits are optimised! VISUM Junction Editor Same file format as VISSIM (sig files)
- 22. Signal Optimisation in VISSIM Julian Laufer