1. Phoenix Adaptive Control Technology Showcase Cobb County Georgia
Cobb County Adaptive Traffic Control
Brook Martin, Traffic Signal Systems Manager Cobb County Department of Transportation
September 8, 2011

2. About Cobb County Department of Transportation
DOT Assets / Infrastructure
+160 county staff (23 Signals)
2nd largest transit agency in the state and avg. of 380K riders/month.
County Airport was ranked the 200th busiest airport in the country last 10 years.

3. Transportation Best Practices
Cobb County
Transportation Best Practices
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
Manage 545 signals, 61 CCTV cameras, 4 Changeable Message Signs and over 200 miles of fiber optic cable.
Responsible for Signal Timing, Signal Design, Signal Maintenance, TMC Operation
Annual budget of $500,000
Video detection
2070 controllers
Retime every 3 years
Slide 3 – Phoenix Adaptive Control Technology Showcase

4. First Adaptive System in Georgia (2005) Cumberland CID Area
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
We can’t keep widening roads, so we squeeze as much capacity out of our existing transportation infrastructure
Slide 4 – Phoenix Adaptive Control Technology Showcase

5. Performing Arts Center
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

6. Traffic Data Collection
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

7. 24-Hour Coordinated System Detector Triggers
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

8. Signal Maintenance Program Staff Adjustment Period Equipment
SCATS Requirements
Signal Maintenance Program
Staff Adjustment Period
Equipment
Cabinet Relays
Video Detection
Communication
Slide 10 – Phoenix Adaptive Control Technology Showcase

9. Town Center CID Area 75 Intersections I-75/I-575 Corridor
SCATS Future Projects
Town Center CID Area
75 Intersections
I-75/I-575 Corridor
Communication
Video Detection
Today: We just awarded an expansion of our adaptive system in the Town Center Area.
Shopping, interstate, Kennesaw State University events.
Slide 11 – Phoenix Adaptive Control Technology Showcase

10. Total Project - $3.7 Million 271 Cameras – 40% ($22k per intersection)
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%
SCATS Cost
9 year return on investment.
Includes re-cutting loops twice and re-timing signals 3 times
Slide 5 – Phoenix Adaptive Control Technology Showcase

11. SCATS Technology Introduction
Bo Gao, P.E., PTOE

12. SCATS U.S Deployment

13. SCATS Operational Objectives
Minimizes stops and overall delays
True cycle-by-cycle adaptive control
Cycle
Split
Offset
Optimized parameters implemented in next cycle

14. SCATS Data Requirements
Stop Bar Presence Detection
Inductive Loop
Video Detection
Magnetic Detection
Radar Detection
SCATS Operated by Looking at “Space” Between Vehicles
Loop
Space Time (secs)

15. SCATS Functions - Linking
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

16. SCATS Communication Requirements
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 Communication Requirements 16

17. SCATS Hardware Requirements
Central Server/PC
Pentium III or above processor
512 Mb RAM
40 GB hard drive

18. SCATS hardware Requirements (Cont’)
Field Controllers
170 E Controllers Thru Interface Card
2070s Thru Controller Software
ATC Controllers Thru Controller Software
Eagle M50 Series
Econolite ASC/3 18

19. SCATS hardware Requirements (Cont’)
Field Cabinets
SCATS hardware Requirements (Cont’)
332 Series – 170E and 2070 Controllers
NEMA TS 1 & TS2 Type 2 –
2070N and ATC Controllers
NEMA TS2 Type 1 – 2070N and ATC Controllers

20. SCATS Training Controller/Cabinet training System training
Follow-up training

21. Ability to Accommodate Holiday Traffic Fluctuation
Mother’s Day - Sunday May 13, 2001
Sunday May 20, 2001

22. Ability to Accommodate Long-term Growth

23. Intersection Monitoring

24. Alarm Monitoring

25. Real Time - Time / Space Diagram with Integrated Detection Actuations & Theoretical Travel Time Monitoring 25

26. SCATS Features True Cycle-by-Cycle Adaptive
Flexibility on detection, hardware, & communication
No Advanced Detection Required
Is Not Model Based
No Models to Create to Run Adaptive
No Models to Update for New Developments or Traffic Condition Changes
Provides dynamic coordination along a corridor or corridors
Real-time Alarm Monitoring & Notification

27. QUESTIONS. Brook Martin Cobb County DOT (770)528-4065. brook
QUESTIONS? Brook Martin Cobb County DOT (770) Bo Gao TransCore (480)