How-to guides
How to cover a vehicle gate or parking garage entrance against tailgating
A gate that lets two cars through on one credential is an open gate with extra steps. Tighten the gate cycle, put a camera on the approach and a camera on the gate itself, and match footage against the access log.
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Tailgating is when a second vehicle follows an authorized one through a gate before it closes. At gated communities, apartment garages and contractor yards it is the most common way unwanted vehicles get in, and it leaves no trace in the access-control log because only one credential was used. Cameras help, but the gate itself does most of the work.
Fix the gate before adding cameras
Tightening the gate cycle
- 1
Measure how long the gate stays open
Time a full cycle with a single car: open, car clears, close. If the gate sits open well after the car has cleared, ask your gate technician to shorten the hold-open timer within the operator's safety settings.
- 2
Check the vehicle detection loops or sensors
Gates use in-ground loops or sensors to know a vehicle is present. Safety loops keep the gate from closing on a car and must stay. But a poorly placed exit or reopen loop can hold the gate open for the next car. Have a licensed gate technician review loop layout; do not disable safety devices.
- 3
Consider a faster or different barrier
Slow swing gates give a following car plenty of time. High-speed barrier arms, or a barrier arm in front of a slide gate, close the gap faster. This is a capital decision, so get footage of the problem first.
- 4
Post clear signage
One vehicle per entry, cameras in use, and what happens to vehicles without permission, written in plain language and only stating what is true. Signage sets expectations for residents and gives the property something to point to.
Two cameras per gate
| Camera | Job | Placement guidance |
|---|---|---|
| Approach / plate camera | Read plates and see the vehicle front | Low and close to the lane, aimed along the direction of travel with a small horizontal angle to the plate. Narrow field of view, fast shutter, IR or plate-specific camera for night |
| Gate overview camera | Show the whole cycle: who badged, who followed, how far apart | Higher, from the side or behind, covering the keypad or reader, the gate and a car length either side |
| Optional driver camera | See the driver at the reader | At window height near the keypad, facing the driver's side |
Plate capture is unforgiving. A camera mounted high on a pole and looking steeply down, or angled sharply across the lane, will catch glare and skewed characters. Plate reads at night also need a short shutter speed so the characters do not smear. The camera detection range guide covers plate-reading distance and resolution.
Use the footage against the log
A monthly tailgating review
- 1
Pull the access log for a busy window
Pick a few evening hours when residents return. Export the credential entries with timestamps.
- 2
Count vehicles on the overview camera for the same window
More vehicles than credentials means tailgating. Note the times.
- 3
Look for patterns
Is it the same vehicles? Residents letting in guests? Delivery drivers following residents? Each pattern has a different fix: guest passes, delivery codes, or enforcement letters.
- 4
Feed it back into rules and timing
Adjust gate timing, guest procedures or signage, then repeat the review next month to see if the count moved.
Check that the camera recorder and the access-control system agree on the time. If the clocks drift apart, matching a credential to a vehicle gets slow and arguable. Most recorders can sync to an NTP time server; set it once and check it during your monthly camera health check.
After hours
Overnight, tailgating overlaps with gate forcing, people walking in through the pedestrian gate, and vehicles cruising the garage. Analytics can flag a person or vehicle in the garage at hours when traffic is unusual, and live monitoring lets an operator speak over a talk-down speaker while the vehicle is still inside. During the day, the review process above is usually the better tool.
Common questions
- Can a camera stop tailgating on its own?
- No. A camera records who followed whom. Shortening the gate cycle, fixing loop layout and posting clear rules reduce how often it happens; footage tells you who is doing it.
- Where should a license plate camera be mounted at a gate?
- Low and close to the lane, looking along the direction of travel so the plate is close to straight-on, with a narrow field of view and a fast shutter for night. Steep downward angles and sharp side angles cause failed reads.
- Should we disable the gate's safety sensors to make it close faster?
- No. Safety loops and photo eyes prevent the gate closing on vehicles and people. Have a licensed gate technician adjust timing and loop layout within the operator's safety settings.
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