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H THE HOUSTON SYSTEM
INCIDENT DETECTION USING PROBE VEHICLES
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altemate routes arterial street Average Travel Blocking Blocking cellular telephones College Station commercial vehicle commuters congestion Day-of-Week for Link detect incidents diversion False Alarm Rates Figure IV-4 ﬂow freeway corridor fuel savings beneﬁts Hardy Toll Road Harris County Houston HOV lane I-45 North Freeway I-45 North Fwy incident conditions incident detection algorithms Incident Detection Rates incident information incident reports infomration IVHS Lane All Lane lane-blocking incidents liters/km loop detectors measured travel North corridor Number of Incidents percent Phase PM Peak Periods probe drivers probe travel probe vehicles queue Rates for I-45 real-time information Real-Time Travel Information reporting locations RTTIS signiﬁcant signiﬁcantly SND algorithm SND values speciﬁc speed Standard Deviation Table Texas A&M University Texas Transportation Institute Thursday Friday Average Time-of-Day and Day-of-Week traffic traﬁic travel conditions Travel Information System travel time information travel time measurements Travel Time Standard Tuesday Wednesday Thursday TxDOT users Wednesday Thursday Friday xx xx