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 ObjectivesEric Graves, P.E.City Traffic EngineerAlpharetta, Georgia
2 Alpharetta Transportation System 50,00 ResidentsDay Time Population~100,000ADPHPUPSNorth Point LCIDowntown LCI
3 Alpharetta Transportation System 4 Interchanges with GA 400 (Limited Access Freeway)7, 4-6 Lane Arterial Streets~ 120 Traffic Signals3 Emergency Signals at Fire Stations1 Hawk Signal – AprilAll newer equipment – GDOT ATC Program332 cabinets2070 controllers – SEPAC FirmwareEthernet Communications60% direct connections to City TCC
4 Traffic Operations 2 Public Works Crews 1 Signal Systems Engineer SignsSignals1 Signal Systems Engineer1 Traffic Engineering TechnicianInspect Construction ProjectsManage maintenance contractsStripingLoop Repairs
5 Traffic Operations Signal Systems Engineer Signal Timing Maintenance ProgramSystemic timing of all traffic signals every 2-3 yearsBefore/After travel time measurementsTiming reports to be published on the City Web Site (soon)
6 Why Adaptive?? Less $$ available for capacity improvements Less opportunity for new roadway connectionsAlpharetta is land locked and nearly built outEssential we operate our system as efficiently as possibleInitiative includedSystems / Timing EngineerPM ProgramTiming Maintenance Program
7 Why Adaptive ?? Traffic STILL a top concern from citizen survey What else can be done???Cobb County SCATS SystemCouncilman read article on SCATS SuccessDirected Staff to investigate options for Alpharetta
8 When Adaptive Makes Sense Unpredictable Traffic FlowHigh sustained growthFreeway system interactions
9 When Adaptive Makes Sense Agency CapabilitiesTechnician capabilitiesDetection at 98%!!Strong communicationsFiber along all major corridorsStable Ethernet field network
10 When Adaptive Makes Sense Agency CapabilitiesEngineering StaffIn-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 systemCycle length- appropriate for volumeSplit percentages- balanced or prioritizedOffsets- provide good progressionPeak-hour performance on day 365 and 730 should be better than doing nothingPause for questions
13 Alpharetta’s Criteria Should be able to perform close to manual optimized timingsMaximize the utilization of existing infrastructure332 cabinets/ 2070 controllers/ SEPAC FirmwareEthernet Communications/ECOMMOptimize Progression on CorridorsProvide Queue ManagementCoordinate crossing arterials??Manual control??Special events/Seasonal Peaks/Incidents
15 Identified SolutionsThe City of Alpharetta performed demonstration projects with two adaptive platformsInSync and SCOOTThe results of the demo projects indicated that adaptive solutions could replicate current timing effortsPotentially improving operations for special events, unexpected events, and off peaks periods
16 Other Systems Considered SCATSNew FirmwareNew DetectionSeparate Central SystemOPACDistributed solution – more rigorous detection requirementsACS LitePresently not available in TACTICSPresently does not optimize cycle length
17 Next Steps SR 9 18 mile corridor Sandy SpringsRoswellAlpharettaGDOT18 mile corridorCollector between outer suburbs and GA 400 interchangesPrimary arterial (Sandy Springs/Roswell)Back up for GA 400PM 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 requirementsFHWA determined documentation was insufficient to sole source
19 SR 9 ATMS ProjectGDOT/FHWA Required PM Team to follow Federal Regulations mandating System Engineering Process to select Adaptive Solution
20 SR 9 ATMS ProjectSystems Engineering Report completed and accepted by FHWASystems Engineering Process identified similar functional requirements as the Alpharetta demo projectsSCOOT determined as preferred optionCompatible hardware with jurisdiction platformAbility to coordinate with non-adaptive intersections using Tactics Central System
21 SR 9 ATMS ProjectProject recently received NTP!!
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