Barriers and gates sit at the intersection of security, safety, operations, and customer experience. In a commercial environment, they are used to:

  • Control who (or what) can enter a site, building, car park, or secure zone
  • Slow, channel, or stop movement so checks can occur (credential checks, visitor validation, screening, safety checks)
  • Create auditability (who entered, when, under what authority) when integrated with access control systems
  • Deter opportunistic misuse and raise the effort required for hostile or unauthorised access

This page explains common barrier types—Vehicle barriers, turnstiles, security gates, boom barriers—in a way that works for both a layperson and a security specialist planning commercial deployments.

Plain-English overview: what you are buying

Think of barriers and gates as managed “pinch points”. Instead of trying to secure every metre of perimeter equally, you design a small number of controlled entry/exit points and make them:

  • visible and discouraging to bypass
  • safe to use
  • reliable at the expected traffic volumes
  • measurable (events and alarms)
  • supportable (maintenance, spares, uptime)

Core categories

Vehicle barriers

Vehicle barriers cover a spectrum—from simple traffic management up to crash-rated hostile vehicle mitigation equipment. In commercial settings they commonly protect:

  • vehicle entrances to car parks and loading docks
  • logistics yards
  • high-value or high-risk sites (data centres, critical utilities, corporate HQ)

At the traffic-management end, vehicle barriers may focus on authorised entry and orderly flow. At the higher-security end, they can be specified and tested to resist deliberate vehicle ramming.

For hostile vehicle scenarios, the security industry uses recognised impact testing standards such as IWA 14-1, PAS 68, and ASTM F2656 for vehicle security barriers (VSBs) (see references). For example, Avon Barrier summarises these standards as criteria for physical impact testing of vehicle security barriers, positioned as assurance of performance against vehicular attack (Avon Barrier – Certification & Testing). A separate explainer on IWA 14-1 describes it as an impact test method for vehicle security barriers intended to provide an international basis for comparing products (ATG Access – What is IWA 14-1).

Commercial note: Many sites over-specify “anti-ram” hardware when the real problem is unauthorised parking, theft, or tailgating. Conversely, some sites under-specify and end up with a barrier that manages traffic but offers limited resistance to deliberate forced entry. Selecting the right class starts with threat definition, not catalogue selection.

Boom barriers (boom gates)

A boom barrier is typically a raising/lowering arm used to regulate vehicle access—common at car parks, toll lanes, and private drive entries. They are primarily about permission and flow control, not stopping a determined vehicle at speed.

As a baseline definition, a boom barrier is a horizontal pivoting arm used to permit or prohibit vehicle passage by raising and lowering (Automatic Systems product range notes boom arms for parking and perimeter access).

Where boom barriers fit well

  • staff and visitor car parks
  • commercial office parks
  • managed entry points where vehicles can queue safely
  • sites wanting quick throughput with credential checks (RFID, ANPR, QR codes)

Where they can be a weak control

  • where there is room for vehicles to bypass the boom (wide lanes, adjacent footpaths, poor kerb design)
  • where threat includes deliberate vehicle ramming
  • where safety engineering is insufficient (no loops/sensors, poor signage, unsafe closing forces)

For high-risk vehicle threats, organisations often move from simple booms to crash-rated barriers/road blockers/bollards, specified against test standards such as IWA 14-1 / PAS 68 / ASTM F2656 (Avon Barrier – Certification & Testing).

Security gates

“Security gates” is a broad label that can include:

  • sliding or swing vehicle gates
  • bi-folding gates
  • pedestrian swing gates
  • crash-rated vehicle gates (specialised)

Security gates are usually chosen when you need a full-lane physical closure and stronger boundary control than a boom arm provides, or when you need to integrate with fencing lines and secure perimeters.

Some gate solutions are also engineered for hostile vehicle mitigation and may be tested under recognised standards. Avon Barrier, for example, lists gates among product types included in their crash-tested HVM programme, tested to PAS 68 / IWA 14-1 / ASTM F2656 criteria (Avon Barrier – Crash Tested HVM Products).

Practical trade-offs

  • Gates generally have slower cycle times than boom barriers and can reduce throughput.
  • They can provide stronger denial and better perimeter integrity when aligned with fencing and boundary treatments.
  • They often require more civil works, space, and ongoing maintenance.

Turnstiles (pedestrian access control)

Turnstiles are pedestrian barriers designed to allow one person at a time through a controlled point, reducing tailgating and improving entry discipline. They are common in:

  • commercial office lobbies and secure tenant zones
  • stadiums and event venues
  • industrial sites with PPE / safety compliance needs
  • transport hubs and controlled public access areas

A manufacturer example describes turnstiles as part of pedestrian products used to control entrances, with options ranging from tripod turnstiles (moderate security, high flow) to full-height turnstiles intended for higher security perimeter control (Automatic Systems product range).

Key design choice

  • Half-height / optical speed gates: better user experience, higher throughput, typically indoor/lobby contexts
  • Full-height turnstiles: stronger physical control, better for external perimeters and industrial sites

How to choose the right solution (commercial decision framework)

1) Define the problem in operational terms

Start with “what must be true” statements:

  • Only authorised vehicles enter the staff car park
  • Visitors enter only via reception during business hours
  • Contractors can access loading dock between defined hours
  • After-hours entry creates alerts and captures evidence

This avoids buying hardware to solve an undefined risk.

2) Define the threat and the consequence

A pragmatic commercial approach separates:

  • accidental misuse (wrong-way entry, delivery confusion)
  • opportunistic unauthorised access (tailgating, casual trespass)
  • determined intrusion (forced entry, coordinated theft)
  • hostile vehicle scenarios (ramming, VBIED concerns in some contexts)

If hostile vehicle mitigation is in scope, look for solutions tested against recognised standards such as IWA 14-1 / PAS 68 / ASTM F2656 (Avon Barrier – Certification & Testing; ATG Access – What is IWA 14-1).

3) Balance flow rate vs control strength

  • Boom barriers excel at vehicle throughput.
  • Security gates often trade throughput for stronger denial and perimeter integrity.
  • Turnstiles trade some convenience for pedestrian control and auditability.

4) Design out bypass and unsafe behaviour

Common failure modes are not mechanical—they are architectural and procedural:

  • vehicles driving around a boom barrier because kerbs and islands are missing
  • pedestrians bypassing turnstiles through adjacent doors
  • tailgating because credential validation is not enforced or alarms are ignored

Physical design (lane geometry, fencing tie-ins, sight lines) must match the hardware.

5) Integrate with systems that make it “commercially useful”

Modern barriers and gates become substantially more valuable when they integrate with:

  • access control (RFID/badges, mobile credentials)
  • intercoms and visitor management
  • ANPR/LPR where appropriate
  • CCTV for verification and incident review
  • monitoring/alarms into SOC or facilities response

Safety, compliance, and governance considerations (what specialists look for)

Even in a purely commercial context, barriers create safety and liability exposure. A fit-for-purpose design includes:

  • safety sensors/loops/photocells to reduce strike/closing incidents
  • emergency egress and fail-safe modes appropriate to the site
  • clear signage, lighting, line marking, and user instruction
  • maintenance regimes, spare parts strategy, and uptime targets
  • documented risk assessment and commissioning records

For hostile vehicle mitigation procurements, specialists also look for:

  • test evidence (ratings and documentation) under recognised standards
  • installation conditions matching test assumptions (foundation, soil, anchoring, approach conditions)
  • alignment with a wider design strategy (speed management, standoff distances, layered controls)

Typical commercial use cases (examples)

Office park / corporate campus

  • Boom barriers at vehicle entry for staff/visitor management
  • Turnstiles or speed gates for pedestrian access to secure buildings
  • Security gates for after-hours locking down vehicle entrances

Logistics / manufacturing site

  • Security gates or heavy-duty vehicle barriers for yard control
  • Full-height turnstiles for staff and contractor entry
  • zoning for safety and compliance (PPE enforcement points)

Retail / mixed-use precinct

  • Boom barriers to manage parking revenue and tenant access
  • pedestrian controls focused more on safety and after-hours restriction than high-security turnstiles

External references