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EDUCATIONAL ARTICLES ON DRIVEWAY LOOPS
Loops: Proper Placement and Size BD Loops
By Brian Dickson
LOOP PLACEMENT AND SIZE (continued) We’re on the Installer’s Side

By Brian Dickson, BD Loops

Swing gates require a total of three loops: two reverse loops on each side of the gate and a shadow
loop. Reverse loops being installed on a swing gate need to be placed on each side of the gate, two feet
from each curb and four feet away from the gate in its open position. Finding their size follows the same
formula as slide gates: x – 4 = z. What is different in this gate system is the addition of a shadow loop. This
loop is placed under the opening path of the gate, two feet away from the curb and four feet away from
the gate in its closed position and four feet away from the gate in its open position. To determine the leg of
the loop that is parallel to the gate in its closed position (y) subtract the driveway width (x) by 6 feet,
represented by this formula: x – 6 = y. To find the leg of the loop that is parallel to the curb (a) subtract the
driveway width (x) by four feet, represented by this formula: x – 4 = a. An exit loop in this gate system is
optional and can be the reverse loops on the inside of the property (which will require a separate detector)
or another loop can positioned a minimum of four feet away from reverse loop on the inside of the
property.

ouble swing gates require a total of three loops: two reverse loops on each side of the gate and a
shadow loop. The reverse loops follow the same method of installation as swing gates; two feet from each
curb and four feet away from the gate in its open position. Finding their size follows the same formula as
slide gates and swing gates (x – 4 = z). To find the shadow loop leg that is parallel to the gate in its closed
position (b), you need to subtract the driveway width (x) by eight; represented by this formula: x – 8 = b. To
find the shadow loop leg that is parallel to the gate in its open position (c), you need to divide the driveway
width (x) by two, then subtract that amount by four feet represented by this formula: (x / 2) – 4 = c. An exit
loop in this gate system is optional and can be the reverse loops on the inside of the property (which will
require a separate detector) or another loop can be positioned a minimum of four feet away from the
reverse loop on the inside of the property.
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