Short answer: An automatic bollard is an access security system in which a steel body embedded in the ground rises 500–800 mm by hydraulic or electromechanical drive to physically stop unauthorised vehicle access. A high-security installation is built with a series matched to the risk level, the right ground and drainage infrastructure, access control integration and a defined emergency scenario.
Boom barriers regulate traffic, but they are not designed to physically stop a determined driver. At points where unauthorised vehicle entry could have serious consequences, such as in front of office towers, public buildings, energy facilities and pedestrian zones, bollards come into play. Because they sit flush with the ground in the lowered position, they do not spoil the architecture, and when needed they rise within seconds to place a physical obstacle in front of a vehicle. In this article we look at bollards in terms of security level, scenario design and installation infrastructure. For technical values, see our automatic bollard page.
What security need does an automatic bollard meet?
The key difference of a bollard is that it blocks access rather than merely marking it. When the body rises, a steel cylinder stands in front of the vehicle; so its use should be assessed according to the risk level of the protected point. In practice, three different groups of needs are seen:
- Access order: Ensuring that only authorised vehicles enter at residential complexes, apartment developments and hotels. Here, aesthetics, quiet operation and ease of use come to the fore.
- Zone closure: Closing pedestrian zones to vehicle traffic at certain times, and controlling service and fire brigade access. Flexibility and fast opening for emergency vehicles are important.
- High security: Public and military facilities, energy and infrastructure sites, diplomatic buildings. Here, protection against vehicle attacks, a crash-tested body and fast rise are decisive.
A series should not be selected until it is clear which group applies. At a point requiring high security a standard series falls short, while at a residential complex an anti-terrorism class body creates unnecessary cost and construction work.
Which bollard series should be chosen?
The Pack Door range includes five different types of bollard. Security level, daily cycle count and maintenance expectations are assessed together when choosing:
| Series | Drive / construction | Typical use | Key feature |
|---|---|---|---|
| PD Bollard H (hydraulic) | Integrated hydraulic unit inside the body | Residential complex entrances, office towers and hotels, high-traffic points | Approx. 3–6 s rise, high cycle rate |
| PD Bollard E (electromechanical) | Oil-free electromechanical drive | Pedestrian zones, historic and tourist areas, residential complexes | Quiet, low maintenance, heater option for cold climates |
| PD Bollard HS (high security) | Reinforced thick-walled steel body | Public and military facilities, energy sites, embassies | Crash-tested models (project-dependent), emergency fast operation (EFO) option |
| PD Bollard R (removable) | Manual, locking socket | Event areas, service and fire brigade access routes, side streets | No power required, covered recessed socket |
| PD Bollard F (fixed) | Anchored to or embedded in the ground | Building facade protection, pavements, shopfronts | Permanent perimeter protection |
The common technical values are as follows: body diameter of 220–275 mm depending on the model, rise height of 500–800 mm, and a body made of painted St37 steel or AISI 304/316 stainless steel. The body has an IP67 protection rating; an LED light ring and reflective band provide day and night visibility, and an audible warning can be added as an option. In seafront and salty environments, choosing a stainless steel body prevents surface deterioration in the long term.
How are the security scenario and integration designed?
A bollard on its own is just hardware; what provides security is the scenario built around it. The scenario defines under what conditions a vehicle may pass, who is authorised and how the system will behave in an unusual situation.
Authorisation layer
The bollard integrates with remote controls, card access, number plate recognition (LPR), loop detectors and car park management software. In high-security facilities, two layers are usually used together: for example, pre-verification by number plate recognition and lowering on approval from the security gatehouse. Entry and exit records are reported.
Vehicle and pedestrian safety
The loop detector prevents the body from rising while a vehicle is above it. The LED ring and audible warning notify drivers and pedestrians in advance that the bollard is about to move. At high-security points, adding a traffic light and warning sign in front of the bollard reduces the risk of accidental collision.
Emergency behaviour
During a power cut, manual lowering is done via a pressure release valve on hydraulic models and a key lock on electromechanical models; if a battery unit is fitted, automatic operation continues throughout the outage. A fast-lowering scenario is defined for emergency vehicles such as ambulances and fire engines. In the high-security series, the opposite may be required: the EFO (emergency fast operation) option, which raises the body faster than normal in the event of a threat.
How is the installation infrastructure prepared?
In bollard projects, a significant part of the work is underground. Because the body is embedded in the ground, even the best bollard will soon cause problems if excavation, concrete pouring, drainage and cable ducting are not done correctly. The following steps are followed before installation:
- Defining the risk level and usage scenario in writing
- Identifying the ground structure and underground utility lines (electricity, water, natural gas, telecoms)
- Designing the foundation box excavation and concrete pouring detail
- Guaranteeing water discharge by connecting the base of the box to a drainage line
- Planning the cable duct to the control panel and the integration cables
- Mechanical installation, commissioning and scenario testing (authorised passage, emergency lowering, power outage)
Note from the field: The source of bollard failures is often not the bollard itself but water accumulating inside the foundation box. In boxes without drainage or with an inadequate connection to the municipal network, the water level rises in rainy periods and there is a risk of freezing in winter. During site surveys we always check the slope of the site, whether rainwater flows towards the bollard location and the level of the nearest drainage line. This is also why we consider the heater option on the electromechanical series in cold regions.
Common mistakes
- Positioning a boom barrier as if it were a security barrier: A boom barrier regulates traffic but does not physically stop vehicles. For traffic management-focused solutions, see our guide to barrier systems and car park management.
- Leaving drainage until later: A foundation box without water discharge damages the drive and electrical components.
- Not defining an emergency vehicle scenario: How the fire brigade and ambulances will pass must be determined from the outset.
- Saving on warning equipment: A bollard that rises without an LED ring and warning can lead to accidental collisions.
- Choosing a low-capacity series for intensive cycling: At points with hundreds of cycles per day, the hydraulic series is recommended.
Frequently asked questions
What is the difference between a hydraulic and an electromechanical bollard?
The hydraulic series offers fast rise and high cycle capacity. The electromechanical series uses no oil, runs more quietly and requires less maintenance; it is preferred in medium-traffic areas.
What happens to an automatic bollard during a power cut?
Access is opened by lowering it by hand with the manual release valve or key. If a battery unit is fitted, automatic operation continues during the outage.
Does an automatic bollard work with number plate recognition?
Yes. When the number plate recognition camera identifies an authorised vehicle, the bollard lowers automatically. It can also be used with card access, remote controls and loop detectors.
What is needed to install an automatic bollard?
Foundation box excavation, concrete pouring, a drainage connection and a cable duct are needed. Once the infrastructure is ready, mechanical installation and commissioning are completed quickly.
Conclusion and next step
With the right risk analysis, a suitable series, solid underground infrastructure and a well-designed access scenario, an automatic bollard becomes a genuine security layer. You can find other perimeter security solutions on the gate and access systems page. Send us your free site survey request so we can inspect the ground and drainage conditions at your entrance on site.
