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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

Vehicle detector loop layout

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

Cut-in Loop Wire

Loop Installation

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  

Cut-in Loop

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.

Loop DetectorExit 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. A Shadow Loop keeps the gate open while a vehicle is above it, just like a safety loop, but only functions when the gate is in the full open position.


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



Probe Style Loop

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

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.