Bollards: fixed, removable, folding and retractable — and when a barrier is the better answer

What a bollard is actually for

A bollard protects and demarcates. It holds a vehicle away from a building line, a shopfront, a pedestrian area, a fuel point or a substation, and it marks a boundary that a driver can see.

What a bollard does not do is manage traffic flow. It has no idea who is arriving, it does not meter a queue, and it cannot let one vehicle through and stop the next. If the job is deciding who may enter, a bollard is the wrong tool and the rest of this guide will point you at the right one.

The four types

Everything on the market is one of four arrangements, and they differ mainly in how often you need the opening to change.

• A removable bollard is only as secure as its socket and its lock — and it needs somewhere to be stored when it is out, or it will be lost inside a year
• Folding bollards are the usual answer to reserved parking; they are also the ones most often defeated, because the padlock is the whole security
• Anything that retracts needs drainage in the pit; standing water is what kills automatic bollards in practice

Cost, complexity and maintenance rise steeply down this table. Retractable bollards are the most expensive way to close an opening and the most expensive to keep working — they earn their place only where the opening genuinely changes many times a day.

Impact rating: the question most specifications miss

This is where bollard buying goes wrong. A steel tube set in concrete will stop a car rolling into a shopfront. It will not stop a vehicle driven at it deliberately, and the difference between those two is not something you can judge by looking at the bollard.

Where impact resistance genuinely matters, it is established by crash testing against a published standard — internationally IWA 14-1, in the UK PAS 68, and in the United States ASTM F2656. A rating from any of these describes a specific test: a vehicle of a stated mass, at a stated speed, and how far the vehicle penetrated past the barrier. A bollard with no such rating is a deterrent and a demarcation, which is a perfectly legitimate thing to buy — as long as you know that is what you are buying.

So the specification question is not “is it strong?” but “what is it rated to, and to which standard?” If the answer is none, price it as a demarcation bollard and do not rely on it for hostile vehicle mitigation.

Spacing and foundations

Two details decide whether an installed bollard line works, and neither is on the product datasheet.

Spacing governs what gets through. Set the gaps by what must pass — a wheelchair, a pram, a delivery trolley — and by what must not. A line spaced generously enough to be comfortable for pedestrians is usually still close enough to exclude a car, but that is a decision to make deliberately rather than by eye.

The foundation does the work. A bollard resists impact through what is under the surface, not what is above it. A heavy bollard in a shallow pad will simply lever out, taking a slab of concrete with it — and it will look identical to a correctly installed one right up until the moment it is hit. Whoever supplies the bollard should state the foundation it assumes, and whoever pours the slab should build that foundation.

• Check what is under the surface before you design anything — services, cables and drainage decide where a socket or pit can actually go
• Leave a maintained accessible route through any bollard line; it is a design requirement, not a courtesy
• Reflective banding where vehicles manoeuvre at night — most bollard damage is low-speed reversing, not attack

When you actually want a barrier

A good deal of bollard enquiry turns out, on the first phone call, to be an access-control problem wearing a bollard costume. If any of these describe your site, a barrier will serve you better and usually cost less to own:

• You need to decide who comes in. That is a boom barrier tied to your access control — see choosing a boom gate.
• You need to enforce direction — vehicles out but never in, or the reverse. That is a spike barrier, which lies flat the permitted way and stops a vehicle taking the lane the wrong way.
• You need the opening closed after hours. That is a gate.
• People are walking in beside the cars. No bollard addresses that; it needs a controlled pedestrian lane — a full-height turnstile at an unmanned entrance.

What iMAT can and cannot supply

Straight answer, because it saves everybody a phone call: bollards are not part of the iMAT catalogue range. What iMAT manufactures for vehicle entrances is boom barriers and spike barriers, in mild or stainless steel, with a 2-year warranty excluding electronic components.

Fixed and removable steel bollards are ordinary fabrication, and fabrication is something iMAT does do — the custom workshop exists for exactly the things that are not in the range. If you need a run of static or socketed bollards made and finished to match the rest of your site, that is a conversation worth having. Crash-rated hostile vehicle mitigation bollards are a tested, certified product and are not something we will pretend to offer.

If you are not sure which side of that line your site falls on, describe the entrance — including what you are trying to stop and whether anything needs to pass — and we will tell you honestly whether it is a barrier, a fabricated bollard, or something we do not make.

Common questions