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Loop Detectors & Driveway Loops Overview

Articles and Illustrations:
Cut-in Loop Installation Diagram
General Loop Info
Technical Loop Info
Trouble Shooting Loops

Overview - Introduction to Loop Detectors & Driveway Loops

Loop wire has special impermeable insulation and is inserted into slots that have been cut in the asphalt, or concrete. The loops are sealed with loop sealant.

Cut-in Loop Wire

Recently thinner loop wire has become available that can be installed in a 1/8" wide slot. This size slot can be made with a Skill Saw with 7 1/4" diamond blade. See installation diagram  

Loop detectors are used to detect the presence of vehicles. Typically the loop is connected to a loop detector (pictured on right). Some gate operators have built in sockets to accept loop detectors and some models require the detector to be wired in.

Exit loops are used to open gates to allow a vehicle's exit.

Safety loops are used to prevent a gate from closing on a vehicle. Two loops can be wired to one detector. This is frequently the case in safety loops. Loops are placed in front and behind the gate.

Shadow Loops are typically used in commercial locations. They close the gate as soon as a vehicle passes over them deterring other vehicles from tailgating in behind them.

Preformed Loops are placed below the surface prior to laying asphalt or pouring concrete. They are available in several sizes depending on driveway width.

Self Contained Probe Style Detectors can only be used as an exit device. They are buried a few inches below the surface beside the driveway. See installation diagram

Loop Sealant should be used to seal cut in loops. Sealant comes in asphalt and concrete colors. It is best to use a commercial grade sealant verses asphalt in a tube found in hardware stores.