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Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia

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Presentation on theme: "Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia"— Presentation transcript:

1 Eric Graves, P.E. City Traffic Engineer Alpharetta, Georgia
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 1 Signal Systems Engineer
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 Peak-hour performance on day 365 and 730 should be better than doing nothing Pause for questions

13 Alpharetta’s 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**

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 Distributed solution – more rigorous detection requirements ACS Lite Presently not available in TACTICS Presently does not optimize cycle length

17 Next Steps SR 9 18 mile corridor
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!!


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