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Adaptive Signal Control Technology: Managing Risks, Achieving Objectives Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia.

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Presentation on theme: "Adaptive Signal Control Technology: Managing Risks, Achieving Objectives Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia."— Presentation transcript:

1 Adaptive Signal Control Technology: Managing Risks, Achieving Objectives Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia

2 Alpharetta Transportation System 50,00 Residents Day Time Population~100,000 – ADP – HP – UPS – North Point LCI – Downtown LCI

3 Alpharetta Transportation System 4 Interchanges with GA 400 (Limited Access Freeway) 7, 4-6 Lane Arterial Streets ~ 120 Traffic Signals – 3 Emergency Signals at Fire Stations – 1 Hawk Signal – April All newer equipment – GDOT ATC Program – 332 cabinets – 2070 controllers – SEPAC Firmware – Ethernet Communications 60% direct connections to City TCC

4 Traffic Operations 2 Public Works Crews – Signs – Signals 1 Signal Systems Engineer 1 Traffic Engineering Technician – Inspect Construction Projects – Manage maintenance contracts Striping Loop Repairs

5 Traffic Operations Signal Systems Engineer – Signal Timing Maintenance Program – Systemic timing of all traffic signals every 2-3 years – Before/After travel time measurements – Timing reports to be published on the City Web Site (soon)

6 Why Adaptive?? Less $$ available for capacity improvements Less opportunity for new roadway connections – Alpharetta is land locked and nearly built out Essential we operate our system as efficiently as possible – Initiative included Systems / Timing Engineer PM Program Timing Maintenance Program

7 Why Adaptive ?? Traffic STILL a top concern from citizen survey What else can be done??? Cobb County SCATS System – Councilman read article on SCATS Success Directed Staff to investigate options for Alpharetta

8 When Adaptive Makes Sense Unpredictable Traffic Flow – High sustained growth – Freeway system interactions

9 When Adaptive Makes Sense Agency Capabilities – Technician capabilities Detection at 98%!! Strong communications – Fiber along all major corridors – Stable Ethernet field network

10 When Adaptive Makes Sense Agency Capabilities – Engineering Staff In-house signal timing maintenance program One of the best signal timers in the state

11 When Adaptive Makes Sense Desire Continuously Optimized Timings!!

12 Alpharetta Adaptive Signal Evaluation: Hypothesis A well-timed system is a well-timed system Cycle length- appropriate for volume Split percentages- balanced or prioritized Offsets- provide good progression

13 Alpharettas Criteria Should be able to perform close to manual optimized timings Maximize the utilization of existing infrastructure – 332 cabinets/ 2070 controllers/ SEPAC Firmware – Ethernet Communications/ECOMM Optimize Progression on Corridors Provide Queue Management Coordinate crossing arterials?? Manual control?? – Special events/Seasonal Peaks/Incidents

14 Identified Solutions SCATS – Cobb County SCOOT **OFFERED DEMO** ACS Lite InSync **OFFERED DEMO**

15 Identified Solutions The City of Alpharetta performed demonstration projects with two adaptive platforms – InSync and SCOOT The results of the demo projects indicated that adaptive solutions could replicate current timing efforts – Potentially improving operations for special events, unexpected events, and off peaks periods

16 Other Systems Considered SCATS – New Firmware – New Detection – Separate Central System OPAC – New Firmware – Separate Central System – Distributed solution – more rigorous detection requirements ACS Lite – Presently not available in TACTICS – Presently does not optimize cycle length

17 Next Steps SR 9 – Sandy Springs – Roswell – Alpharetta – GDOT 18 mile corridor – Collector between outer suburbs and GA 400 interchanges – Primary arterial (Sandy Springs/Roswell) – Back up for GA 400 PM Team identified Adaptive as an ITS Strategy

18 SR 9 ATMS Project PM Team initially considered performance Spec – FHWA/GDOT indicated that as written only one vender likely fulfilled requirements – FHWA determined documentation was insufficient to sole source

19 SR 9 ATMS Project GDOT/FHWA Required PM Team to follow Federal Regulations mandating System Engineering Process to select Adaptive Solution

20 SR 9 ATMS Project Systems Engineering Report completed and accepted by FHWA – Systems Engineering Process identified similar functional requirements as the Alpharetta demo projects – SCOOT determined as preferred option Compatible hardware with jurisdiction platform Ability to coordinate with non-adaptive intersections using Tactics Central System

21 SR 9 ATMS Project Project recently received NTP!!

22 Questions??


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