Estimating median velocity instead of mean velocity at single loop detectors |
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| Institution: | 1. Laboratory of Genital Tract Biology, Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women''s Hospital and Harvard Medical School, Boston, MA, USA;2. CONRAD, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, VA, USA;1. Department of Immunology, School of Medicine, Konkuk University, Chungju 380-701, Republic of Korea;2. College of Medicine, Korea University, Seoul 136-701, Republic of Korea;3. College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea;4. Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA;5. College of Pharmacy, Duksung Women''s University, Seoul 132-714, Republic of Korea |
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| Abstract: | Loop detectors are the preeminent vehicle detector for freeway traffic surveillance. Although single loops have been used for decades, debate continues on how to interpret the measurements. Many researchers have sought better estimates of velocity from single loops. The preceding work has emphasized techniques that use many samples of aggregate flow and occupancy to reduce the estimation error. Although rarely noted, these techniques effectively seek to reduce the bias due to long vehicles in measured occupancy. This paper presents a different approach, using a new aggregation methodology to estimate velocity and reduce the impact of long vehicles in the original traffic measurements. In contrast to conventional practice, the new estimate significantly reduces velocity estimation errors when it is not possible to control for a wide range of vehicle lengths. |
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