Manual or automatic
Both spellings turn up in South Africa — boom gate and boomgate mean the same thing, and so does boom barrier. What matters is whether a person or a motor lifts the arm.
A manual boom is counterweighted: a guard pushes the weight down and the arm swings up. The iMAT manual vehicle barrier runs the arm and weight on a roller bearing and locks with a padlock in either the vertical or horizontal position. There is nothing to fail electrically, which is exactly why it still earns its place at low-volume, permanently manned entrances — a farm gate, a yard that opens twice a day, a contractor entrance.
An automatic boom is the right answer the moment traffic is regular, the entrance is unmanned, or a credential rather than a person decides who comes in. The iMAT automatic vehicle barrier is driven by a maintenance-free 24V brushless DC motor and is built for heavy traffic flow.
| Manual boom | Automatic boom | |
|---|---|---|
| Needs a person at the lane | Always | No |
| Suits regular traffic | No — the guard becomes the bottleneck | Yes |
| Links to access control | No | Yes — card, tag, remote, plate recognition |
| Fails during a power cut | Nothing to fail | Needs a manual release and, ideally, battery backup |
| Ongoing maintenance | Bearing and coating | Motor, loops, electronics, coating |
The honest test is how often the arm moves. An arm lifted a few times a day rarely justifies a motor; one lifted every few minutes always does.
The arm itself
Arm length follows the lane, not the other way round. Measure the clear opening you must close, then add the mounting position — a boom that stops short of the kerb leaves a gap a motorcycle will use, and one that overshoots gets clipped by trucks. Across the iMAT vehicle range, poles are supplied in 3 m, 4 m, 4.5 m and 6 m, in round or octagonal profile.
Profile is not decoration. An octagonal pole resists twist better than a round one over a long span, which matters most at 6 m and on windy, exposed sites.
A catch post at the far end takes the load off the motor when the arm is down and stops it bouncing. It is available on iMAT boom poles and is worth having on any long arm.
Skirts, lights and reflective striping are what stop the arm being driven through in the dark. A red/green illuminating strip comes standard on the automatic barrier, and it does more for compliance at the lane than any amount of signage.
What decides whether it lasts
Booms live outdoors, get hit, and cycle thousands of times a month. Three things separate one that lasts from one that does not.
- The motor. A brushless DC motor has no brushes to wear out, which is why the iMAT automatic barrier uses one and is described as maintenance-free. Ask any supplier what is inside the housing and what replacing it costs.
- The housing and the base. Mild steel or stainless, with epoxy coating options — and, on the iMAT barrier, a separate galvanised mounting base. That separate base is the detail most specifications miss: it gives the cabinet rigidity and it is what you unbolt when a vehicle eventually hits the housing.
- The coating. Coastal air eats mild steel. Hot-dip galvanising or epoxy powder coating is the difference between a boom that looks acceptable in year five and one that is rusting at the base in year two — see the materials guide.
Loops, safety and the arm on the bonnet
The single most common boom gate failure is the arm coming down on a vehicle, and it is almost always a loop problem rather than a barrier problem.
An induction loop is a wire loop cut into the road surface that senses the metal mass of a vehicle. A working entrance needs the barrier to know two different things: that a vehicle is waiting, and that a vehicle is still underneath. Those are usually separate loops doing separate jobs, and the second one is the safety loop that holds the arm up until the lane is clear.
The iMAT automatic barrier is supplied with one loop detector. Whether your lane needs a second depends on the layout and on whether it is manned — settle that when the entrance is designed, not when the first bonnet is dented.
- Decide explicitly whether the arm closes behind each vehicle or stays up for a queue — tailgating through a boom is otherwise trivial
- Loops are cut into the surface, so the road has to be in a fit state; a crumbling apron will break a loop
- Anything that presents a credential from a car window slows the lane far more than the barrier does — if the queue backs into the road, fix identification, not the boom
Load-shedding
Any boom gate specified in South Africa without a written answer for a power failure is unfinished. Two separate questions need answering, and they are often confused.
First: can the arm be released by hand, by whoever is actually on site at 20:00? A manual release that needs a technician is not a release. Second: does the entrance stay controlled without mains power, or merely passable? Those are opposite outcomes, and which one you want depends entirely on whether the site is manned.
It is worth noting which equipment answers this by design. The iMAT flush-mount spike barrier offers manual opening on power failure as a standard feature — the same question, answered at the point of specification rather than left to the installer.
Getting a comparable quote
Boom gate quotes are notoriously hard to compare because suppliers price different scopes. Give everyone the same six facts and the quotes become comparable: the clear lane width, vehicles per hour at peak, manned or unmanned, what identifies the vehicle, the surface and its condition, and the required power-failure behaviour.
Ask explicitly whether civils, loop cutting, the electrical supply and the access-control interface are included — that is usually where two quotes actually differ.
iMAT manufactures both the manual and automatic vehicle barriers locally, in mild or stainless steel, with a 2-year warranty excluding electronics, and the barrier is compatible with all access control systems. Send us the lane details and we will spec it.
Common questions
What is the difference between a boom gate and a boomgate?
Nothing — they are the same product and both spellings are used in South Africa, along with boom barrier. What matters is whether it is manual or automatic, and what arm length the lane needs.
Will a boom gate stop a vehicle?
No. A boom gate meters traffic and signals a stop; it is not designed to physically restrain a vehicle driven through it. Where you need to stop a vehicle, that is the job of a spike barrier against the wrong direction, a closed gate, or rated bollards.
What arm length do I need?
Measure the clear opening the arm must close and allow for where the cabinet sits. iMAT supplies poles in 3 m, 4 m, 4.5 m and 6 m, round or octagonal; octagonal resists twist better on the longer spans.
What happens to an automatic boom during load-shedding?
That depends entirely on how it was specified. Insist on a documented manual release that on-site staff can operate, and decide in advance whether the entrance should stay controlled or become passable when the power is off.
Do I need one loop or two?
One loop can tell the barrier a vehicle has arrived. Keeping the arm up until the vehicle has cleared is a second job, and on most lanes a second loop. Settle this at design stage — it is the usual cause of an arm coming down on a bonnet.