cobb county georgia phoenix adaptive control technology showcase cobb county georgia cobb county...
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PHOENIX ADAPTIVE CONTROL TECHNOLOGY SHOWCASE C O B B C O U N T Y G E O R G I A
Cobb County Adaptive Traffic ControlBrook Martin, Traffic Signal Systems Manager Cobb County Department of Transportation
September 8, 2011
ABOUT COBB COUNTY DEPARTMENT OF TRANSPORTATION
TRANSPO
RTATION
BEST PRACTICESCobb County
Slide 3 – Phoenix Adaptive Control Technology Showcase
• 545 Traffic Signals• 400 Direct Connect to TMC
• 60 CCTV Cameras• 4 Changeable Message Signs • 250 Miles of Fiber• 1000 Video Detection Cameras• Strengths
• Signal Timing• Signal Maintenance
SCATS SYSTEM
First Adaptive System in Georgia (2005)•Cumberland CID Area•I-75/I-285 Interchange•74 Intersections along 8 Corridors•332 Cabinets & 2070L Controllers•Single Mode Fiber Communication•Video Detection
Slide 4 – Phoenix Adaptive Control Technology Showcase
SCATS SPECIAL EVENTS
Cobb Galleria• 30% Traffic Volume Increase
Performing Arts Center• 80% Traffic Volume Increase
Cumberland Mall• Seasonal Shopping
Summer/Holidays• Traffic Demand Reduction
Slide 7 – Phoenix Adaptive Control Technology Showcase
SCATS FEATURES
Traffic Data Collection• Average Daily Traffic Volumes• Turning Movement Counts
Monitoring Capability• Daily Operation & Daily Maintenance
Slide 8 – Phoenix Adaptive Control Technology Showcase
SCATS BENEFITS
• 24-Hour Coordinated System• Detector Triggers• Railroad Pre-Emption Operation• Reduced Delay/Travel Times• Eliminates Retiming Projects• Stable Software• Good Support• Few Complaints
Slide 9 – Phoenix Adaptive Control Technology Showcase
SCATS REQUIREMENTS
• Signal Maintenance Program
• Staff Adjustment Period• Equipment
Cabinet Relays Video Detection Communication
Slide 10 – Phoenix Adaptive Control Technology Showcase
SCATS FUTURE PROJECTS
Town Center CID Area• 75 Intersections• I-75/I-575 Corridor• Communication• Video Detection
Slide 11 – Phoenix Adaptive Control Technology Showcase
SCATS COST
CUMBERLAND CID AREA (2005)Total Project - $3.7 Million
• 271 Cameras – 40% ($22k per intersection)• SCATS – 30% ($15k per intersection)• Misc. Signal Equipment – 30%
TOWN CENTER CID AREA (2011)Total Project - $3.9 Million
• 358 Cameras - 70% ($36k per intersection)• SCATS - 20% ($11k per intersection)• Misc. Signal Equipment - 10%
Slide 5 – Phoenix Adaptive Control Technology Showcase
SCATS Technology Introduction
Bo Gao, P.E., PTOE
SCATS U.S D
eployment
SCATS Operational O
bjectives
• Minimizes stops and overall delays• True cycle-by-cycle adaptive control
– Cycle– Split– Offset
• Optimized parameters implemented in next cycle
Stop Bar Presence Detection
Inductive Loop Video Detection Magnetic Detection Radar Detection
SCATS Operated by Looking at “Space” Between Vehicles
LoopSpace Time (secs)
SCATS Data Requirem
ents
Intersections Can “Marry" or “Divorce"
Married Intersections Operate on a Common Cycle Length & Offset Plan
User Defined Marriage Options:• When CL's are Within 10 sec or• When One-Way Volume Exceeds a
Configured Threshold or• When a “Forced” / Continuous
Marriage is Required Algorithms Focus on Minimal
Cycle-by-Cycle Adjustments to Stabilize Progression & Coordination
SCATS Functions - Linking
• Multiple Communications Options
• Serial Communications– Point-to-Point – Point-to-Multipoint
• Ethernet Communications– Copper– Fiber– Wireless
• Once per second polling and data exchange
• Band width - 8 kbps /per controller
SCATS Comm
unication Requirements
• Central Server/PC– Pentium III or above processor
– 512 Mb RAM
– 40 GB hard drive
SCATS Hardw
are Requirements
• Field Controllers
– 170 E Controllers Thru Interface Card
– 2070s Thru Controller Software
– ATC Controllers Thru Controller Software• Eagle M50 Series• Econolite ASC/3
SCATS hardware Requirem
ents (Cont’)
• Field Cabinets
332 Series –170E and 2070 Controllers
332 Series –170E and 2070 Controllers
NEMA TS 1 & TS2 Type 2 –2070N and ATC ControllersNEMA TS 1 & TS2 Type 2 –2070N and ATC Controllers
NEMA TS2 Type 1 – 2070N and ATC Controllers
NEMA TS2 Type 1 – 2070N and ATC Controllers
SCATS hardware Requirem
ents (Cont’)
• Controller/Cabinet training
• System training
• Follow-up training
SCATS Training
Mother’s Day - Sunday May 13, 2001
Sunday May 20, 2001
Ability to Accommodate Holiday Traffic Fluctuation
Ability to Accommodate Holiday Traffic Fluctuation
Ability to Accommodate Long-term GrowthAbility to Accommodate Long-term Growth
Intersection MonitoringIntersection Monitoring
Alarm MonitoringAlarm Monitoring
Real Time - Time / Space Diagram with Integrated Detection Actuations & Theoretical Travel Time Monitoring
True Cycle-by-Cycle Adaptive Flexibility on detection, hardware, &
communication No Advanced Detection Required Is Not Model Based
No Models to Create to Run AdaptiveNo Models to Update for New Developments or
Traffic Condition Changes Provides dynamic coordination along a corridor or
corridors Real-time Alarm Monitoring & Notification
SCATS Features
QUESTIONS?
Brook Martin Cobb County DOT (770)528-4065 [email protected]
Bo GaoTransCore(480)[email protected]