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www.ptvamerica.com
Traffic Signal Control and SimulationKaren Giese, Vice President Product Management, PTV AmericaAndrew Bratlien, Associate, PTV AmericaMiranda Wells, DKS Associates
Oregon Microsimulation RoundtableMarch 2012
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Agenda
Introduction to VISSIM Simulation> What is VISSIM?> Why Simulation?
Simulation Signal Control> Range of Options> Standard Internal Control> Hardware-in-the-Loop> Software-in-the-Loop> External Custom Programs
Software-in-the-Loop Applications> What is it?> Why use it?> What is available?
Software-in-the-Loop Examples> McCain BiTrans> Econolite ASC/3> D4
Discussion and Demonstrations2
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation 3
PTV Vision
VISUM> Strategic Planning Platform
TRAFFIX> Intersection Capacity Analysis
VISSIM> Microscopic Traffic & Transit Simulator
PTV Vision is a fully integrated suite of transportation planning/travel demand modeling and traffic simulation for all modes of transportation.
PTV Vision incorporates macro, meso, and microscopic levels analyses dynamically over time.
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation4
What is VISSIM?
Microscopic transit/traffic simulation consisting of> Traffic flow model which moves and tracks each vehicle> Signal control model
User-friendly graphical interface (GUI)> Graphical network editor for data input of road network, transit lines, routes,
volumes, detectors, signals, etc.> Definition of user-specific vehicle types (passenger cars, HOV-cars, trucks,
buses, articulated buses, trams, LRT-vehicles, bicyclists, pedestrians etc.)> Definition of user specific driving behavior to override default values
Decision support system> On-line visualization of traffic operation in 2D and 3D> Measures of effectiveness like delay, queue length, travel times, mean speed,
emissions etc
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation5
What is VISSIM?
Microscopic transit/traffic simulation consisting of> Traffic flow model which moves and tracks each vehicle> Signal control model
User-friendly graphical interface (GUI)> Graphical network editor for data input of road network, transit lines, routes,
volumes, detectors, signals, etc.> Definition of user-specific vehicle types (passenger cars, HOV-cars, trucks,
buses, articulated buses, trams, LRT-vehicles, bicyclists, pedestrians etc.)> Definition of user specific driving behavior to override default values
Decision support system> On-line visualization of traffic operation in 2D and 3D> Measures of effectiveness like delay, queue length, travel times, mean speed,
emissions etc
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation6
Core Building Blocks of VISSIM
Four core building blocks in VISSIM
> Network representing the physical infrastructure for roadway and tracks
> Traffic representing the vehicular movements on the network
> Control representing how traffic behaves in case of conflicting movements
> Output generating results from simulation runs
CONTROL Unsignalize
d Signals
TRAFFIC Vehicles Behavior Routing
Network Geometry Transit
Output Animation MOE´s
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Why Simulation?
Accurately Measure Impacts of Dynamic Conditions
> Transit Signal Priority
> Preemption
> Ramp Metering
> ITS – Variable Message Signs, Traveler Information
Measure Design Limitations
> Spillback Effects
> Inadequate Storage Lengths for Peak Period
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Why Simulation?
Understand System Integration/Transitions
> Freeway ↔ Arterial
> Transit↔ Private Transport
Advanced Problems
> Curbside Modeling
> Dynamic Traffic Assignment
> Lane Management Strategy (Toll Pricing, HOV/HOT Lanes)
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Simulation Signal Control
Provides traffic control for vehicles
Emulate or directly implement specific controller functionality
???
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
VISSIM Signal Control Options
Rules of the Road
Signal Controllers
Ring Barrier Controller (RBC)
VAP
Fixed Time Controller (VISSIG)
Hardware-in-the-Loop
Software-in-the-Loop
External Signal API
Rules of the Road
Special Applications
Transit Signal Priority
Railroad Preemption
Adaptive Signal Control
Rules of the Road
General Applications
Fixed Time Control
Actuated Control
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
VISSIM Standard Control: Ring-Barrier Controller (RBC)
Embedded RBC GUI facilitates entering of signal timing data
NTCIP 1202 Compliant
Extensive Functionality
> Multiple Rings & Barriers
> Free-running and 8 Timing Patterns
> Overlaps / Negative Overlaps
> Railroad Preemption> Transit Signal Priority> Advanced Timing and
Detection Parameters11
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
VISSIM Standard Control: Ring-Barrier Controller (RBC)
Transit Priority Settings
> Alternating Sequence
> Transit Phases> Vehicle Omits> Pedestrian Omits> Priority Modes
(Early / Extend)> Priority Min Green> Recovery Min
Green> Priority
Progression> Check-in / Check-
out12
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
VISSIM Standard Control: Ring-Barrier Controller (RBC)
Applications> Standard signal control operations> ???> When you can use it
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Moving Beyond the Standard Control
Public agencies have preferred signal controller vendors with specific hardware / software solutions
Actual controller logic can model true signal controller behavior
> Required for controller-specific behavior> Capture true operations of advanced / special features
Options in VISSIM> VAP Custom Program> External Signal Control API> Hardware-in-the-Loop> Software-in-the-Loop
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
External Custom Programs
VAP> VISSIM Internal Programming Language> Write Custom Signal Control Logic> ???
External Signal Control API> Develop Custom Program> Compiled Program Ties to VISSIM Through API> ???
Application> Emulate functions not available in RBC> More closely represent specialized functions (e.g., transit signal
priority)> ???
15
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Hardware-in-the-Loop
Controller Logic Directly Integrated into VISSIM
Connected through Controller Interface Device
No “Emulation”
Requires Hardware
INSERT PHOTO OF CONTROLLER / CID
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Software-in-the-Loop (SIL)
What is SIL?> Replaces hardware-in-the-loop> Same logic as firmware > Virtual time clock and calendar> Timing parameter database exchange with
field controllers > Commercial signal control firmware interfaces
directly with VISSIM’s Signal Controller API
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Software-in-the-Loop (SIL)
Why Use it?> Integrate Controller Logic Directly into VISSIM> Remove “Emulation” Errors / Bias
> Capture True Operations of Advanced / Special Features> Accurately Model Controller-Specific Logic
> Remove Hardware Requirement> Faster than Real Time> Synchronization
What’s Available?> BiTrans (McCain)> D4 Controller (Fourth Dimension)> ASC/3 (Econolite)> SCATS?
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation
Fourth Dimension D4 Controller
Key Features
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© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation20
Econolite ASC/3 Controller
Key Features> 16 Phases/16 Overlaps> 16 Ped Phases/16 Ped Overlaps> 4 Rings> 64 Detectors> Phase Compatibility Matrix> Logic Processors – Emulate External Logic/PLC> Coordination/Preempt> NTCIP 1202 Compliance
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation21
ASC/3 SIL Controller – Database Editor
> icons™> .db is transferred
between VISSIM and ASC/3 controller (hardware) via NTCIP Database Manager
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation22
ASC/3 SIL Controller – Front Panel Display
> ASC/3 Menu Structure> Online Controller Status> Detector Status> Real-time Database Update
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation23
ASC/3 SIL Controller – Logic Processing
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation24
ASC/3 SIL Controller – I/O Mapping
© PTV America 2012 PTV America, Inc. – Traffic Signal Control and Simulation25
Questions and Discussion
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