AbstractLoop 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.
Estimating median velocity instead of mean velocity at single loop detectors
Tramsportation Research, Part C: Emerging Technologies ; 11 , 3-4 ; 211-222
2003-01-01
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Estimating median velocity instead of mean velocity at single loop detectors
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