Transcript Mississippi DOT - Intelligent Transportation Society of

Adaptive Signals
ITS GA 2009 Annual Meeting
Mark Rogers – Regional Sales Manager Southeast
Dr. Jun Wang – Project Manager
Ben Robinson – Arcadis
© Siemens 2009. All rights reserved.
What are the Ground Rules of Adaptive Control ?
Adaptive Control DOES
 Reduce or Eliminate the Need to Retime Signals
 Respond to Stochastic Changes in Traffic
 Help Delay Onset of Saturation
 Help Exit Saturation Sooner than Without Adaptive Control
 Reduce Delay
 Require Detection
Adaptive Control DOES NOT
 Increase Capacity
 Eliminate Saturation if Roadway is Over Capacity
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The State of Traffic Signal Operations
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Traffic Signals Compete for Resources
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Traffic Signal Control Evolution
Late 1960s
Open Loop System
With Traffic
Detection
Centralized Control
UTCS
Central Control
Interval or Phase Control
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Mid to Late
1980s
Mid 1990s
2000
Closed Loop Control
Closed Loop
Adaptive Control
Central
Timing Plan selection by
Field Master
Traffic Responsive /
Adaptive Control
SCATS
SCOOT
ATCS
Timing Plan selection by
Field Master (ACS-Lite)
Adaptive Control
RHODES
OPAC
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Traffic Signal Control Evolution (A Few Highlights)
Traffic Responsive (Started in UTCS Type Systems)
 Started in UTCS Systems
 Used Time Hysteresis to Avoid Constant Transition
 Used % Better for Determining Plan Change Conditions
 Required Significant Configuration
 Still Requires Signal Timing Optimization
SCAT and SCOOT
 SCAT = Sydney Coordinated Adaptive Traffic
 SCOOT = Split Cycle Offset Optimization Technique
 Both Are Well Established and Have Been Studied Extensively
 Both Process Data at the Central Computer Level
RT-TRACS (Real-Time – Traffic Adaptive Signal Control System
 RHODES – Realtime Hierarchical Optimized Distributed Effective System
 OPAC – Optimized Policies for Adaptive Control
 Both process data at the intersection level
ACS Lite (Adaptive Control Software)
 Currently Does not Do Cycle Adjustment
 Does Split and Offset
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SCOOT Principles
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SCOOT Demand Profiles
Cyclic Flow
at the
Detector
Dispersion Model
Journey (Travel) Time
Stopline Demand
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SCOOT Queue Model
Flow
Rate
Time now
Cyclic Flow Profile
Saturation
flow rate
Cruise
speed
ACTUAL
QUEUE
Flow adds to
back of queue
Modelled
queue at
time’now’
Time ‘now’
Stop Line
Red time
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July 15
Green time
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Optimizers
Optimiser
Split
Frequency
Change values
(seconds)
Every phase change
+4, 0, -4 (temporary)
+1, 0, -1 (permanent)
(typical)
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Offset
Once per cycle
+4, 0, -4
Cycle time
Every 5 or
2.5 minutes
+4, 0, -4 (32-64)
+8, 0, -8 (64-128)
+16, 0, -16 (128-240)
July 15
(typical)
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SCOOT Split / Cycle / Offset Optimizer (What is the
approach?)
Split Approach
 Balance saturation and congestion
 Considers each approach in turn
Cycle Approach
 Minimise overall delay
 Considers each SCOOT region individually
Offset Approach
 Minimise stops, delay and congestion
 Considers one node at a time
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ACS Lite System Architecture
 ACS Lite Plan Changes
 Split and Offset
 Cycle After Phase II
 ACS Lite processor
 Field master, or
 Central server
 User Interface (UI)
 Web-based
 Easy configuration
 Upload most data
 Just known facts
 No calibration
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Laptop/Central
ACS Lite
ACS-Lite User Interface
May run as field master, in cabinet.
or on a server at a central operations facility
Local Controllers
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ACS Lite Measuring Demand
Phase Timing
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Volume/Occupancy
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ACS Lite Detector Data During Green
 Occupancy during green is distinguished from occupancy during red
(this is slightly simplified for clarity)
Cycle 1
Second-by-second
Occupancy
37s
49s
37s
32s
4s
Cycle 2
Second-by-second
Occupancy
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4s
17s
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ACS Lite Averages Demand Over Last Few Cycles
Averaging
Unoccupied
Phase 2
Average
Occupancy
29s
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July 15
4s
57s
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ACS Lite Example : (Before Adjustment – 100%
Saturation of a Phase)
 Balance degree of saturation across phases
 Bias to allocate “extra” green to progression phases
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ACS Lite Example : (After adjustment –
Rebalanced with no over-saturation)
 Balance degree of saturation across phases
 Bias to allocate “extra” green to progression phases
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SR-120 Old Milton Parkway, Alpharetta
• 5 intersections
• Direct IP communication
• Loop detectors
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System Architecture
ACTRA
PC SCOOT
TACTICS
Ethernet
SCOOT Comm Server
Ethernet
Ethernet
Ethernet
Serial
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July 15
Ethernet
Serial
Serial
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Alpharetta SCOOT Deployment Schedule
Detector survey
 Sensys, Temple, Siemen, Gresham Smith & Partners
SCOOT System Configuration
 Siemens
(Done)
(Done)
Sensys detector Installation
 Sensys, Temple, and City of Alpharetta
(09/29 – 10/02)
Detector Validation
 Siemens
(10/05 – 10/06)
System Integration
 Siemens
(10/06 – 10/09)
System Evaluation
(11/16 – 11/20)
 City of Alpharetta, Siemens, Gresham Smith & Partners
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SR-154 Cascade Pkwy, Fulton County, GA
•Closed-Loop system with 8 intersections
•19200 baud communication (fiber to serial)
•Video detection at stop bar
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Fulton County ACSLite Deployment
Upgrade controller firmware
• Arcadis, Siemens
Convert controller database
• Arcadis, Siemens
Set up additional detection
• Fulton County, Arcadis, Siemens
System Integration
• Siemens, Arcadis
System Evaluation
• Siemens, Arcadis
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Upgrade Controller Firmware
 SEPAC 3.3.2 g to SEPAC 4.0.1.f NTCIP
 8 MB CPU required
 Serial or Ethernet
 Need MAC address to get a activation key
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Convert Controller database
Manual update of controller database
 No automatic conversion to NTCIP database available
 NextEdit is used to upload/download/edit NTCIP database
Mapping between D/S/O to pattern number
 SEPAC:
2/1/1 = pattern 19
Coordination reference point
 Must use “Start of green”
Ring structure change
 Remove unused phases
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Detector Set Up
Detector zone size
Camera adjustment
Detector validation
Advanced detector (new)
Stop-bar detector (existing)
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System Architecture
Static IP
Comcast cable
Static IP
Ethernet
Ethernet
Ethernet
Serial
Ethernet
Fiber
Serial
Fiber
Serial
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July 15
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System Integration
Disable master
Software installation (Lite)
ACSLite Configuration
• Communication (COM/IP)
• Set up Master feature (TOD)
• Sequence & pattern (validate)
• Set up detectors (distance, length)
• Set up links (length, phase)
• Status Monitoring
• Adaptive Control
Current Project Status
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July 15
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Industry sector, Mobility division, US, Traffic Solutions
Thank You
Mark Rogers
Regional Sales Manager
Traffic Solutions
Industry
Mobility Division
Siemens Energy and Automation, Inc.
5405 Metric Place
Norcross, GA 30092
USA
Mobile 678.296.7481
[email protected]
www.itssiemens.com
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© Siemens 2009. All rights reserved.
Industry sector, Mobility division, US, Traffic Solutions