On this page
- 01Before you start
- 02Automatic boom barriers
- 03Road blockers and rising bollards (HVM)
- 04Tyre killers / spike barriers
- 05Under vehicle inspection (UVIS / UVSS)
- 06Personnel screening and pedestrian control
- 07Integration example
- 08Civil works and installation
- 09Fail-safe vs fail-secure
- 10Application starting points
- 11Check that it works
- 12Common problems and how to fix them
- 13Frequently asked questions
- 14Talk to PSS about vehicle barriers
Physical security starts at the perimeter — before a visitor reaches the building. Unauthorized access, vehicle control, concealed threats and critical-asset protection need barriers, inspection tech, identification and procedures working as one checkpoint, not a pile of devices.
Parking sites mostly need efficient access control. Critical infrastructure may need under-vehicle inspection, personnel screening and crash-rated barriers against hostile vehicle impact. A coordinated solution may include boom barriers and gates, HVM (road blockers / crash bollards), tyre killers, UVIS, personnel screening, ANPR/RFID/access control, plus CCTV, VMS and alarm management. Treat a rated barrier as a small civil structure that moves — the datasheet rating means nothing unless the foundation reproduces the tested condition.
Before you start
- Threat: accidental vehicle, ram raid, or vehicle-borne device?
- Required standard, penetration band, client/insurer acceptance?
- Vehicle classes, approach speed, road geometry?
- Soil/structure — who signs the foundation?
- Drainage, ducts, dedicated power at each position?
- Manual release / emergency procedure — who holds keys?
- Duty cycle and peak queue?
- UVIS / ANPR / HHMD / turnstile scope?
- Integration: access, CCTV, ANPR, fire alarm?
- Maintenance contract and response time?
Automatic boom barriers
A motorized cabinet, controller and horizontal arm raise for authorized passage and lower to close the lane. Common at parking, offices, compounds, hotels, industrial and controlled entrances.
Sequence: authorization from card/RFID/ANPR/parking system/intercom/guard → motor raises arm → vehicle passes → safety confirms clear → arm closes. Fully automatic or guard-driven.
Boom length (indicative): select for actual lane width, cabinet position, clearance, wind and OEM limits. Very wide openings often need two coordinated barriers or another gate type — not one overstretched arm.
| Approx. boom | Typical use |
|---|---|
| 3–4 m | Narrow entrances, selected parking lanes |
| 4–5 m | Standard commercial / residential entrances |
| 5–6 m | Wider lanes, selected industrial |
| 6–8 m | Wide points with a compatible long-arm model |
Specs that matter: opening/closing time vs permitted boom length, full cycle and safety delays (a 1.5 s open claim is not the lane’s vehicle rate); duty cycle (residential vs continuous logistics/toll); motor/drive (noise, efficiency, intensive use — brushless alone does not prove duty rating); IP and temperature for outdoor dust/heat/humidity/corrosion; interfaces to access, parking software, ANPR, RFID, traffic lights and the security platform.
Safety — induction loops and photocells: loops in the road surface detect vehicle metal presence and help prevent premature close or sequence approach/exit — they are not ANPR and are not a pedestrian safety substitute. Photocells break an optical beam across the lane. Use both where they serve different jobs. Final arrangement follows OEM instructions and applicable safety rules — neither sensor alone is complete protection everywhere.
Road blockers and rising bollards (HVM)
A boom arm controls access; it is generally not designed to stop a determined vehicle impact. Where the assessment includes hostile vehicles, specify a tested road blocker or crash-rated bollard system.
Road blockers — heavy steel wedge/plate across the lane; retracts into a road-level housing when authorized. Common at government, embassies, military, critical infrastructure. Drive may be hydraulic (power pack, cylinders, hoses, sensors) or electromechanical — evaluate speed, duty, environment, maintenance and emergency operation for the model.
Rising bollards — vertical cylinders retract into the ground when access is allowed. Variants: fixed, automatic rising, semi-automatic, removable. Useful when the site wants controlled access with a cleaner look when lowered.
| Aspect | Road blocker | Rising bollard |
|---|---|---|
| Form | Broad barrier across the lane | One or more vertical cylinders |
| Coverage | Often most/all of a defined lane | Depends on count, diameter, spacing |
| Civil works | Substantial foundation; recessed models need a pit | Foundations; retractable need underground space |
| Crash resistance | Only as tested + installed | Only as tested configuration + install |
Heavy steel ≠ crash rating. Bollard clear spacing should typically stay around ≤ 1.2 m so a car cannot pass between — a security decision, not landscaping. Also used: shallow- and deep-mount blockers, rising kerbs (low-speed deterrence — not a substitute for a crash-rated product), crash-rated gates/beams.
Crash ratings
Ask whether the complete configuration was tested to the required standard: PAS 68, IWA 14-1, ASTM F2656/F2656M, or another project standard.
| # | ASTM F2656 | Legacy K (superseded) | Speed (approx.) | Kinetic energy (approx.) |
|---|---|---|---|---|
| 1 | M30 | K4 | 30 mph / 48 km/h | ≈ 750 kJ |
| 2 | M40 | K8 | 40 mph / 64 km/h | ≈ 1.2 MJ |
| 3 | M50 | K12 | 50 mph / 80 km/h | ≈ 2 MJ |
ASTM M-ratings use a ~15,000 lb (6,800 kg) truck; penetration bands: P1 ≤ 1 m, P2 = 1–7 m, P3 = 7–30 m. An M50/P2 still allows up to 7 m of travel — often into the lobby you meant to protect. PAS 68 form:
V/<mass>(<class>)/<speed>/<angle>
e.g.
V/7500(N3)/48/90
. PAS 68 and F2656 use different test vehicles — ratings do not convert; claim both only if tested to both.
K4 / K8 / K12 are legacy (superseded by F2656). A datasheet with only “K12” is a label, not a test — demand the certificate. Historical “15,000 lb at 50 mph” talk belongs to a specific test context — do not generalize to every product called K12.
Verify: standard and test report; vehicle mass and speed; tested foundation/install; penetration/stop result; OEM install requirements; supplied model = tested config. Foundation and surround are part of the solution — wrong concrete voids the rating.
Foundations: shallow-mount blockers — shallow pit but huge slab loads; deep-mount — metre-plus pit + drainage; automatic bollards — reinforced ring + sump. A structural engineer signs the design. Freeze foundation drawings before pour — retrofitting a rated foundation into a finished road costs multiples of the barrier.
Tyre killers / spike barriers
Spikes restrict unauthorized movement; crossing the wrong way can damage tyres by design. Used at restricted entrances, exit lanes and checkpoints against wrong-way traffic.
Types: automatic (hydraulic or electromechanical raise/retract); manual; mechanical one-way spring spikes (discourage wrong-way — not the same as a fully controlled security barrier).
May sequence with a boom: spikes retract for authorized passage, then return when clear — subject to interlocks and emergency procedures. Needs clear signage, correct geometry and written ops — these devices can injure and destroy vehicles.
Not a speed bump. Speed bumps slow traffic; tyre killers restrict with spikes. Not interchangeable with road blockers either.
Under vehicle inspection (UVIS / UVSS)
Cameras and software image the undercarriage for consistent, reviewable records — beyond hand mirrors. Used at government, borders, airports, industry, data centres, logistics and similar.
Typical stack: road-level imager, vehicle detection, processing software, workstation, storage. Line-scan systems stitch successive lines into a continuous underside image as the vehicle moves. Operator checks chassis, axles/wheels, assemblies, attached objects and changes vs a prior scan. Claim 3D only if the product truly supports it.
Install types: fixed embedded lane; portable; mobile/vehicle-mounted (product-specific).
Evaluate: resolution and usable detail; coverage; permitted vehicle speed; clearance and axle load; lighting/processing; road-level environmental rating; storage retention/search; ANPR link; image comparison; AI flagging for operator review; cleaning/maintenance access.
AI / comparison: plate match can pull a prior image and highlight differences — dirt, lighting, load and camera position also cause differences. Treat AI as operator support unless OEM proves validated autonomous detection. UVIS does not chemically find explosives or guarantee every concealed threat.
ANPR + UVIS: plate, image, time and result become a searchable record. Performance depends on camera position, lighting, plate condition, speed and plate format — have a procedure for unreadable plates. Auto cleaning (e.g. air blast) is model-specific, not universal.
Personnel screening and pedestrian control
HHMD — portable EM detector for secondary search after WTMD alarm or portable checks. Alerts: sound / light / vibration. Detects metal (ferrous, stainless, copper, aluminium performance depend on size, shape, orientation, distance and settings) — not a body image and not general non-metal threat detection. Check sensitivity vs nuisance alarms, battery/ergonomics/durability, digital processing where offered. Brand claims (e.g. pacemaker/media safety, standards) must match the exact model datasheet — never assume every HHMD.
WTMD screens the portal; HHMD investigates alarms. Neither replaces millimetre-wave body scanners or baggage X-ray.
Turnstiles / speed gates (where used): indicative throughput — tripod ~30–40 persons/min paper (≈20–28 realistic), full-height ~12–20 (≈10–15), optical ~30–60 (≈25–35); accessible lane ~900 mm. Must fail-safe open on fire alarm and allow free egress. Perimeter may also use 358 mesh, palisade, anti-lift gates — layered with the vehicle checkpoint.
Integration example
High-security vehicle entrance may combine ANPR, UVIS, boom for routine flow, crash-rated blocker/bollards, tyre killers where needed, CCTV, access/visitor software, intercom/guardhouse, traffic lights and loops, plus VMS or PSIM.
Flow sketch: ANPR reads plate → access checks authorization → UVIS captures underside if required → operator follows approval → barrier sequence with safety interlocks → CCTV and central log. Needs compatible interfaces, licences, network and a written sequence of operation.
Civil works and installation
Recessed blockers, rising bollards, UVIS and automatic tyre killers need excavation, reinforced foundations, drainage, conduits and maintenance access — plan before delivery.
Drainage: groundwater, rain and wash water kill pits. Follow OEM drawings and local rules; channels and collection; gravity where feasible; designed sump pumps with alarms if needed; maintainable clean-outs. Storm connections only if permitted — watch backflow and capacity.
Concrete: follow OEM foundation drawings and structural engineer for strength, steel, anchors and curing. ~28 days is a common reference for design strength under standard conditions — actual readiness needs mix, site, tests and engineering sign-off, not a calendar assumption alone.
Hydraulics: protect hose route, bend radius, pressure rating; isolation points; approved ducts — no improvised high-pressure runs.
Electrical / comms: dedicated supply (often 230 V with local isolator — do not share with site lighting), earthing, cabinets, emergency controls; define loss-of-comms behaviour for monitored systems. Civil-defence approval for any egress the barrier may block.
Maintenance access to motors, packs, camera windows, sensors and panels is part of the design — not an afterthought.
Fail-safe vs fail-secure
Meanings depend on device, access design and life-safety rules. Fail-safe often prioritizes a defined safe condition (e.g. release for egress). Fail-secure maintains a defined locked/secure state. They do not mean every barrier must drop or stay up on power loss.
A road blocker may stay raised, lower via backup hydraulics, or need a manual emergency procedure. Define before purchase: power-loss behaviour; backup power; emergency vehicle access; manual operation; comms-loss response; fire/evacuation interaction. Document and commission it. Security must not defeat legal emergency egress.
Also specify: approach speed where a vehicle can really build speed; queue length so peak dwell does not block the public road; openings/hour vs duty rating; manual release, UPS/hand pump and a written power-cut procedure for a busy morning.
Application starting points
| Application | Typical direction | Priority |
|---|---|---|
| Commercial parking | Boom, RFID/ANPR, loops, parking software, CCTV | Flow, authorization, safety |
| Corporate / compounds | Boom, visitor management, ID, intercom; UVIS if policy requires | Employees vs visitors vs contractors |
| Government / embassies | UVIS, ANPR, personnel screening, CCTV, certified HVM as assessed | Authority/consultant threat level |
| Critical / military | Certified HVM, inspection areas, redundant monitoring, documented emergency | Test evidence + structural install |
| Industry / logistics | Heavy vehicles, high volume, environment, continuity | Combine ANPR, gates, boom, inspection, central monitor as needed |
Check that it works
- Authorization path, loops/photocells and barrier cycle tested under load.
- Crash-rated product matches certificate, foundation drawings and as-built install.
- Drainage, sump alarms and dedicated power verified before handover.
- Power-loss, manual release and fire/egress behaviour documented and demonstrated.
- UVIS/ANPR retention and unreadable-plate procedure agreed with operators.
- Maintenance access, contract and response time recorded in handover.
Common problems and how to fix them
Barrier chosen by looks or size
Rating, foundation and penetration result decide performance. Demand the test report and OEM foundation drawings.
Boom without traffic analysis
Open time ≠ throughput. Size duty cycle and queue from peak openings/hour, not brochure open time.
AI UVIS assumed to find every threat
UVIS images the underside; AI flags for review. It does not chemically ID explosives or guarantee concealment.
Drainage and foundation ignored
Pits flood and ratings void. Freeze civil drawings, drainage and structural sign-off before pour.
No emergency / power-loss plan
Define fail behaviour, backup power, manual release and emergency vehicle access before purchase.
All HHMDs treated as equal
Sensitivity, nuisance rate and claimed standards are model-specific. Match the exact datasheet.
K-rating with no certificate; M50 on undesigned slab
Legacy K labels without proof, or rated product on wrong concrete, void the claim. Demand certificate + engineered foundation.
Loop so a car sits on a rising barrier; bollards ~2 m apart
Geometry and clear spacing (typically ≤ 1.2 m) are security decisions. Redesign the lane before commissioning.
Turnstile that locks people in on fire alarm
Must fail-safe open and allow free egress. Integrate with the fire strategy.
No maintenance contract; barrier power shared with lighting
Shared lighting circuits and no service contract kill availability. Dedicated supply and a signed response time.
Frequently asked questions
Does UVIS detect explosives automatically?
It images the underside; analysis may flag objects/changes — conventional optical UVIS does not chemically ID explosives.
Is auto camera cleaning available?
Model-specific — confirm on the datasheet, not as a universal feature.
Does an induction loop detect a walking person?
Designed for vehicle metal — not a pedestrian safety sensor substitute.
Is a road blocker always stronger than a bollard?
Compare certified impact performance and install, not weight.
Is a tyre killer the same as a road blocker?
No. Spikes restrict wrong-way movement; blockers/bollards address crash resistance when rated and installed correctly.
Does HHMD detect non-metals?
No — need other technology for non-metal threats.
Does a crash rating survive any install?
No — only the tested configuration with the correct foundation.
What inputs does a quotation need?
Threat type, required standard/penetration, vehicle classes and approach speed, soil/foundation ownership, drainage and power, emergency procedure, duty/queue, UVIS/ANPR/HHMD scope, integration and maintenance response.
Talk to PSS about vehicle barriers
PSS designs, installs, and maintains access control vehicle checkpoints — boom barriers, HVM, UVIS and related screening — sized from risk, traffic and civil constraints. Contact the PSS team to book a first site survey.
