Gate and Vehicle Access
A vehicle entrance is a heavy object in motion with people and trucks around it. The credential read at a gate looks like the one at a door; nothing else does. The load runs to hundreds of pounds and thousands of cycles, UL 325 governs rather than the egress provisions applying to a swinging door, and an error shows up as a crushed bumper, not an unlocked office. Locks, strikes and exit devices belong to electronic door hardware. The conversation with a driver at the call box belongs to intercom and entry systems. This page is the gate, the operator and the traffic.
The gate decides the operator, not the other way around
Selection starts with measured facts about the leaf: slide, swing, barrier or overhead; weight and length; travel distance; wind a solid panel catches; and how many times a day it does all of that. UL 325 sorts operators into usage classes: Class I residential, Class II general access such as apartment property, Class III limited access such as a factory yard, Class IV restricted access under supervision. A Class II operator on a Class III yard fails early and predictably.
Cycle count is underestimated most often. A distribution site in the Indiana logistics corridor running two shifts of tractor-trailers can cycle a gate more in a month than an office park does in a year, which argues for a continuous-duty operator, or a barrier arm carrying daily volume while the slide gate closes after hours. ASTM F2200 governs how the gate is built, including details retrofits violate: covered rollers, controlled gaps, positive stops, screening near the open position. More on the automated gate operator guide.
Entrapment protection is designed in, never added later
UL 325 expects each entrapment zone to be protected by two independent means, monitored so a failed or disconnected device stops the gate instead of being quietly ignored. That pairs the operator’s inherent sensing with external devices, non-contact photo eyes or contact edges, positioned for the hazard, not for convenient conduit.
The missed zones are the unobvious ones: the pinch at a swing gate hinge, the crush point behind a slide gate as it retracts, the pedestrian walking the vehicle lane because nobody provided a walk gate. Bolting a modern operator onto an old gate goes wrong; the leaf was never built for powered operation.
Detection in and beside the pavement
An entrance uses several loops with separate jobs: one to request an opening, one to hold the gate clear while a vehicle occupies the threshold, one to reset behind a departing vehicle. Adjacent loops interfere unless detector frequencies are set apart deliberately.
Saw-cut loops in Midwest pavement are the seasonal weak point. Freeze-thaw across Illinois, Missouri and Wisconsin works the cut open, water gets in, the wire breaks. A loop that dies in February is a pavement failure, and a new detector will not fix it. Preformed loops in a new pour, radar sensors or probe detectors are worth pricing where cutting is impractical. Plate reading has its own fallback rules, on the license plate recognition guide.
The lane, not only the gate
- Stack length. Measure from the gate back to the public roadway. Where that run is short, the first waiting truck blocks traffic and reader speed will not fix it.
- Reader reach. A pedestal set for a car window is unreachable from a tractor cab; a raised second head keeps drivers seated.
- Turning geometry. A gooseneck placed without checking a semi-trailer’s swept path will be struck.
- Emergency access. Fire department entry is decided by the local fire marshal and the accepted method varies. Confirm before ordering.
Weather that changes the build
Across the Midwest, foundations and conduit go below the frost line or heave pulls posts out of alignment and shears the pathway, while enclosure heaters and drainage keep an operator moving through an ice storm. On the plains, long fence-line runs are lightning-exposed, so surge protection and battery backup with a manual disconnect keep a site working. Along the Gulf, salt air attacks fasteners and enclosures, and a solid panel behaves like a sail in a named storm, so a Houston procedure should name who secures the gates.
Send an aerial or site plan, photographs of the gate and its data plate, a cycle estimate and the vehicle types using it. Gates we did not install are welcome; takeover is covered on security system service and repair. Call (888) 360-0035.