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INCIDENT DETECTION AT TRANSGUIDE
INCIDENT DETECTION ALARM THRESHOLD OPTIMIZATION
ARCHIVED ITS DATA QUALITY AND COMPLETENESS
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abnormal alarm threshold level analysis archived ITS data average incident detection CCTV congestion levels data archive data completeness Department of Transportation detected incidents detection algorithm performance detector data difﬁcult Distribution of Quality downstream sector evaluation false alarm rates False Negative False Positive Federal Highway Administration ﬁeld Figure ﬁle ﬂow geodatabase IDAT Impute missing values incident data incident detection algorithm incident record Intelligent Transportation System lane closure database lane closure events lane detector LCU Subsystem loop detector Main lane manages matched incidents minor alarm threshold minutes moving average speeds Naztec LCU records non-incident periods null number of alarms number of false occupancy data occupancy values percent occupancy quality control ﬂags quality control tests Report researchers result Sample San Antonio District signiﬁcant Spatial Distribution speciﬁc Table Texas Department Texas Transportation Institute total number trafﬁc conditions TRF LCU triggered an alarm TxDOT uncongested trafﬁc vehicles zero occupancy