Development of Congestion Factors for Adjusting Traffic Counts during Congested Periods: Phase 1 – Literature Review and Survey
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2021-09-01
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Edition:April 2021 to September 2021
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Abstract:The inductive loop detectors (ILDs) have been used for many decades to monitor traffic on highways. They have proven to be highly reliable in collecting traffic volumes, traffic speeds, vehicle classes, and a slew of other important traffic variables. Traffic monitoring stations that utilize ILDs are generally installed at highway locations far away from congested areas characterized by slow speeds, tailgating, stop-and-go, as well as frequent lane changes. Despite DOT’s best efforts to install traffic monitoring stations on free-flow highway sections, there are sites and occasions in which queues spill over to the ILD station, resulting in undercount of vehicles and misclassifications when congestion persists. The need for better quantification of traffic state and vehicle classification during congested periods is the motivating factor of this literature review and survey-based study
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