CHOOSING DETECTORS--AND PLACING THEM RIGHT

This article describes a study undertaken in Raleigh, North Carolina on the locations at signalized intersections of the inductive loop detector, classified as either pulse or presence mode. With the exception of the detectors directly behind the stop lines, all were installed as pulse detectors. All data collected in the study were complied with the aid of time-lapse photography. Travel time through an intersection was used in determining the optimum detector type and location. The article contains a description of the method of analysis employed and a summary of the results of the study.