cobb county georgia phoenix adaptive control technology showcase cobb county georgia cobb county...

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 brook.martin@cobbcounty.org

Bo GaoTransCore(480)551-4657bo.gao@transcore.com