ACS Lite Project Overview - Traffic Signal Systems Committee

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ACS LiteEvaluation Results – Phase FailuresTRB - Adaptive Traffic Signal Control WorkshopWashington, DCJanuary 11, 2004Slide 54454035Synchro BaselineACS-LiteWorst CaseTotal Number of Phase Failures:Synchro Baseline: 17ACS-Lite: 24Worst Case: 88 ~70%improvement30Number of Failures2520151050103-1101-1104-12-1105-21-2106-23-2107-32-3108-34-3109-43-4110-45-4111-54-5112-56-5113-65-6114-67-6115-76-7116-7102-7Approach LinkU.S. Department of TransportationFederal Highway AdministrationFHWA Contract No.DTFH61-02-C-00047
ACS Lite“Very High Altitude” Evaluation ResultsTRB - Adaptive Traffic Signal Control WorkshopWashington, DCJanuary 11, 2004Slide 55ACS-Lite testscenarioStart with optimizedsettingsStart with bad Offsets(no split adjustment)Start with bad side-streetSplits(no offset adjustments andprogression bias)Changing volumes &turning proportionsvs. “Do nothing”,initially as ACS-LiteDelay (-0.0%, +0.7%)Travel Time (-0.6%,+2.4%)Delay (-4.2%, +0.9%)Travel Time (-4.0%,+1.3%)Delay (-3.3%, +2.2%)Travel Time (-4.9%,+6.8%)Delay ( -28%, -7.4% )Travel Time ( -6.4%, +3.5% )ConclusionACS-Lite “does no harm”ACS-Lite can find a goodset of offsetsACS-Lite usually makesimprovementACS-Lite providesconsistent delay reductionU.S. Department of TransportationFederal Highway AdministrationFHWA Contract No.DTFH61-02-C-00047
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ACS Lite Project OverviewRaj Ghaman
Page 3 and 4: ACS LiteTRB - Adaptive Traffic Sign
Page 6 and 7: Project PartnersACS LiteTRB - Adapt
Page 8: ACS LiteWhat’s “Lite” about A
Page 11 and 12: ACS LiteTRB - Adaptive Traffic Sign
Page 13 and 14: ACS LiteACS-Lite Algorithms Archite
Page 15 and 16: Run-Time RefinerACS LiteTRB - Adapt
Page 17 and 18: Flow(vphpl)12001000800600400200012:
Page 19 and 20: ACS LiteIllustration of Run-Time Re
Page 25 and 26: ACS LiteIllustration of Transition
Page 27 and 28: ACS LiteIllustration of Time-of-day
Page 35 and 36: ACS LiteRun-Time Refiner Algorithm
Page 37 and 38: ACS LiteSplit Adjustment AlgorithmT
Page 39 and 40: ACS LiteMulti-ring Controller Termi
Page 41 and 42: ACS LiteBalance saturation across b
Page 43 and 44: ACS LiteTypical split adjustment pr
Page 45 and 46: Detector LayoutACS LiteTRB - Adapti
Page 47 and 48: ACS LiteAccount for all coordinated
Page 49 and 50: ACS LiteTypical offset adjustment p
Page 51 and 52: ACS LiteSimulation Performance Test
Page 53: ACS LiteEvaluation Results - Total
Page 57: Questions?ACS LiteTRB - Adaptive Tr
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ACS Lite Project Overview - Traffic Signal Systems Committee

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