Docks, gates and trailer rows, covered from one screen.

What guards actually watch at a warehouse.

Warehouse surveillance splits into two worlds. Outside, there is the gate or guard shack, the truck court in front of the dock doors, rows of parked trailers, the employee parking lot and a long perimeter fence, often backing onto rail lines or empty land. Inside, there are cameras on the dock doors from the inside, the main aisles, high-value cages and the shipping office. Big yards lean on PTZ cameras that sweep across the trailer rows on a preset tour.

The monitoring job depends on the schedule. A distribution center running two shifts has trucks moving at hours when an office park is dark, so “any vehicle after hours” doesn’t work as a rule. Post orders instead focus on where activity happens: people on foot in the trailer rows, anyone at the back fence, a truck at a door that isn’t scheduled, a trailer being hooked up in the middle of the night, a person walking the perimeter instead of heading into the building.

The events that matter, and the ones that don’t.

The nuisance activity at a yard is mostly legitimate operations: yard trucks shuttling trailers, drivers walking to the guard shack, forklifts crossing the dock apron, headlights sweeping the fence as rigs turn in. None of that is a problem, and a guard who gets an alert for each will stop reading them.

The events that matter:

• Someone on foot between trailer rows or along the back fence, away from the dock and the shack.
• A vehicle entering through a secondary gate or parking outside the truck court.
• A trailer moving when the yard is supposed to be idle, or a vehicle backing up to a dock door that isn’t in use.
• Activity at a high-value cage, the fuel island or the equipment parking area after hours.

Why yard cameras are hard to monitor.

PTZ tours leave blind spots.

A PTZ camera on a preset tour covers a lot of ground but only one slice at a time. When it is looking at the east trailer row, the west row is unwatched, and most monitoring setups never tell the guard that. Semaphor follows camera views as they change and marks unobserved time explicitly, never assuming a camera that looked away was quiet. Our PTZ camera tours guide covers how to design tours around that.

Scale.

A large yard fills a video wall on its own. The guard’s real problem is prioritization, not detection. Semaphor’s alert prioritization sorts the inbox Critical, High, Unassessed and Low, and guards can override any level, so the person at the back fence is at the top of the list, not buried under yard-truck traffic.

Glare and night lighting.

Yard lights, truck headlights and wet asphalt create glare and hard shadows at night. Semaphor detects people and vehicles rather than reacting to light changes, and the AI report notes when the image quality itself limits what can be said.

Evidence for claims and investigations.

Cargo theft and yard incidents turn into insurance claims and police reports. Every frame Semaphor processes keeps the original image with an exact SHA-256 hash and perceptual hashes, and alerts export as JSON manifests. See evidence and audit trail for what that means when a client asks what happened at door 14 last Tuesday.

Fire and smoke detection for large storage buildings is in active development, with early access for pilot partners. It is built to complement certified fire alarm and sprinkler systems, not stand in for them.

How it fits your operation.

Semaphor works from the monitoring screen you already have, so there is no VMS to swap and no integration with the warehouse’s camera vendor. Read what Semaphor is, see the related logistics hubs use case, and learn how security guard companies use it to cover yards alongside their other contracts.

Production sites have their own rhythm of shift changes and dock traffic. See AI camera monitoring for manufacturing plants.

Warehouse and yard FAQ.

See it on your own yard cameras. Book a live demo or start a pilot.