Vehicle Loop Detector

Loop Design Essentials /Loop wire/ Loop detector installation Proper installation of the loops is essential for reliable vehicle detection. Most vehicle detector problems are caused by improper loop installation! „ The geometry (shape and size) of the loop defines the detection zone. See the figures to the follow for typical loop geometries used for access or traffic control. „ Loop sizes may differ and will depend on lane width, traffic patterns, and types of vehicles to be detected. The following guidelines are typically used today with most access control applications: ƒ Large rectangular loops (4’ x 8’, 6’ x 8’, 6’ x 12’ are used to detect larger vehicles and high bed vehicles (trucks). ƒ Small size loops (i.e. 2’ x 5’, 3’ x 6’, 6’ x 6’) are used to detect smaller vehicles, such as motorcycles and automobiles. Important Note: Typical detection height is about 2/3 of the shortest leg of the loop. Adjacent loops operating on separate vehicle detectors may interfere (cross-talk) w...