Hostile Vehicle Mitigation (HVM): Protecting Your Bangladesh Premises from Vehicle-Ramming Threats

Vehicle-ramming attacks have become one of the most studied threats in modern security planning. Unlike firearms or explosives, a vehicle is a readily available, difficult-to-restrict weapon capable of causing mass casualties. Security professionals across South Asia have incorporated Hostile Vehicle Mitigation (HVM) planning into their threat assessments following a series of high-profile incidents worldwide.

Bangladesh's security environment — with its concentration of diplomatic missions, central government institutions, and international financial institutions in Dhaka's diplomatic quarter — makes HVM planning a serious subject for facility managers and security consultants alike. This guide explains what HVM is, how the physics of vehicle attacks inform equipment selection, and which products and standards apply to different threat levels.

What Is Hostile Vehicle Mitigation?

Hostile Vehicle Mitigation is the discipline of using physical infrastructure and operational procedures to prevent or limit the impact of a vehicle used as a weapon. HVM is not simply "putting bollards outside your building." It is a structured process that starts with a threat assessment, calculates the kinetic energy of potential vehicle attacks, and selects barriers rated to absorb or redirect that energy.

HVM planning considers:

• The types of vehicles available to a potential attacker
• Realistic attack speeds given road geometry and approach distances
• The asset or crowd being protected
• The operational requirements of the site (authorised vehicle access, pedestrian throughput)
• Architectural and urban planning constraints

A properly designed HVM scheme provides defined standoff distance — the space between the vehicle impact point and the protected asset. Standoff distance reduces the energy transferred to the structure and decreases the lethal radius of any secondary device that might be in the attacking vehicle.

The Physics of a Vehicle Attack: Why Kinetic Energy Defines Your Solution

The destructive power of a vehicle attack is determined by its kinetic energy, calculated as:

KE = ½ × mass × velocity²

This formula has critical implications for HVM design. Velocity matters far more than mass. A 3,500 kg SUV travelling at 80 km/h carries almost four times the kinetic energy of the same vehicle travelling at 40 km/h. A vehicle accelerating from a longer approach road poses a much greater threat than one turning from a tight side street.

Typical Vehicle Parameters Used in HVM Analysis

The barrier you select must be rated to absorb the kinetic energy of the credible threat vehicle at its realistic attack speed on your specific site. A barrier rated for a 1,500 kg car at 48 km/h will fail catastrophically against a 7.5-tonne delivery truck at 64 km/h.

International Standards: PAS 68 and IWA 14

Two international standards define and certify the performance of vehicle security barriers. Understanding them is essential to specifying and procuring an HVM solution with confidence.

PAS 68: Impact Test Specification for Vehicle Security Barriers

PAS 68 (Publicly Available Specification 68) was developed by the British Standards Institution. It defines a standardised crash test for vehicle security barriers — specifying vehicle weight, impact speed, angle of impact, and maximum allowable penetration distance after impact.

PAS 68 results are expressed as a code, for example: V/7500[N3]/80/90:1.0

Breaking this down:

• V: vehicle security barrier
• 7500[N3]: vehicle mass of 7,500 kg (N3 = heavy goods vehicle category)
• 80: impact speed 80 km/h
• 90: angle of impact 90 degrees (head-on)
• 1.0: penetration distance 1.0 metre

A PAS 68 certificate from an accredited test laboratory (Millbrook, TRL, or similar) is the definitive proof of barrier performance. Do not accept unverified manufacturer claims.

IWA 14: Vehicle Security Barriers — Part 1

IWA 14-1 (International Workshop Agreement 14) is the ISO equivalent of PAS 68. Developed to harmonise international standards, IWA 14-1 uses the same classification system and is increasingly the preferred reference in international procurement specifications. For practical purposes, PAS 68 and IWA 14 are functionally equivalent — both require physical crash testing by accredited laboratories.

ASTM F2656: The North American Standard

American facilities and US-affiliated organisations (including US Embassy compounds) commonly reference ASTM F2656, which uses the M30/M40/M50 speed rating system described in our bollard buying guide. All three standards — PAS 68, IWA 14, and ASTM F2656 — are internationally recognised. Specify whichever standard your client or insurer requires.

HVM Solution 1: Road Blockers (Surface Beam Barriers)

Road blockers — also called surface beam barriers or rising kerbs — are the most robust vehicle security barrier available for operational vehicle access points. Unlike bollards, which are cylindrical posts, road blockers are wide steel beams or wedge-shaped steel plates that rise from the road surface to block an entire lane.

How Road Blockers Work

A hydraulic actuator raises a steel beam or plate from a below-ground housing to a position approximately 600–900 mm above the road surface. In the raised position, the beam spans the full width of the vehicle lane — typically 4.0–4.5 metres — creating a solid steel barrier that a vehicle cannot pass at speed. In the lowered position, the road surface is restored and vehicles drive over the housing with no disruption.

Performance Ratings

Road blockers are available with crash test ratings from PAS 68/IWA 14 or ASTM F2656. For high-security sites — embassies, central bank premises, and critical national infrastructure — specify a road blocker rated to stop at minimum a 7,500 kg N3 vehicle at 64 km/h (PAS 68 V/7500[N3]/64/90:1.0 or equivalent). This rating stops the most common heavy goods vehicle threat.

For extreme threat scenarios — including hostile state actors potentially using heavy goods vehicles or even larger vehicles — higher-rated solutions exist, including multi-beam systems and shallow-foundation engineered solutions for sites where deep excavation is not possible.

Installation Considerations in Bangladesh

Road blocker installation requires significant civil engineering. The below-ground housing requires a pit excavation to at least 600–900 mm depth, which may encounter groundwater issues in Dhaka's high water table environment. Your civil contractor must plan for de-watering, waterproof liner installation, and drainage. The hydraulic system requires connection to a power supply and must be protected with a UPS for resilience.

HVM Solution 2: Bollard Arrays

Bollard arrays — a line of closely spaced crash-rated bollards — are the most commonly deployed HVM solution for Bangladesh's commercial and government sector because they combine high security performance with lower installation complexity than road blockers.

For an HVM bollard array, spacing must be 1.2 metres centre-to-centre or less. Any gap greater than approximately 1.5 metres allows a car to pass through diagonally. A credible HVM solution uses crash-rated bollards — not decorative or visual-deterrent bollards — with certified test results.

Automatic rising bollards allow authorised vehicle access within the bollard line while maintaining the barrier. The access opening must be protected by one or more automatic bollards rated to the same or higher standard as the static bollards flanking it.

Bollard arrays are appropriate for:

• Building frontages with pedestrian areas
• Perimeter of outdoor public spaces
• Secondary access points where a road blocker would be operationally impractical

HVM Solution 3: Wedge Barriers

Wedge barriers are a flat steel plate that hinges upward from the road surface to present a steel wedge face to any vehicle attempting to drive over it. Unlike a road blocker that rises from a recessed housing, a wedge barrier mounts on the road surface or a shallow foundation and flips up at high speed.

Wedge barriers are compact, relatively shallow to install (200–300 mm below surface is often sufficient), and fast to actuate. Their flat mounting profile makes them well-suited for sites where road blocker pit excavation is problematic — existing vehicle entrances at established facilities, heritage buildings with constrained sub-surface conditions, and locations with underground services that prevent deep excavation.

The trade-off is that surface-mounted wedge barriers create a slight ramp effect even in the down (clear) position, which can cause discomfort for low-profile vehicles. For high-traffic access points, this is a minor inconvenience. For ceremonial entrances, a road blocker's completely flush surface may be preferred.

Crash Test Performance

Wedge barriers can achieve ratings comparable to road blockers, with leading products certified to PAS 68 for 7,500 kg vehicles at 64 km/h and above. The specific performance depends on whether the barrier is fixed to a concrete foundation (higher performance) or surface-mounted (somewhat lower performance).

HVM Solution 4: Anti-Ram Concrete Barriers

Engineered concrete barriers — purpose-designed Jersey barriers, planter barriers, and anti-ram walls — are a cost-effective option for temporary or semi-permanent HVM deployment. They are not automated (they do not move to permit vehicle access) but can be relocated using a forklift or crane if needed.

Concrete barriers are commonly used for:

• Temporary protection during construction when permanent bollards are being installed
• Crowd event perimeters (concerts, marathons, national day celebrations)
• Rapid deployment following a specific threat elevation
• Supplementing gaps in existing perimeter protection

Concrete barriers must be engineered and weighted correctly. A hollow concrete block that is easily moved by a vehicle provides no real protection. Certified anti-ram concrete planters and barriers are available from HVM specialists; these products are tested and certified just as bollards and road blockers are.

The Bangladesh Threat Landscape

Understanding where HVM is most relevant in Bangladesh requires an honest threat assessment:

Diplomatic Missions: All embassies and high commissions in Dhaka's diplomatic enclave operate under strict security protocols, including HVM perimeters. The US Embassy compound in Baridhara and other major diplomatic missions maintain crash-rated vehicle barriers as a fundamental requirement of host country and international security standards.

Government Buildings: Key government facilities — Parliament, Prime Minister's Office, key ministries — maintain high-specification perimeter security. Recent years have seen increasing investment in structured HVM planning for government premises following security reviews.

Banking and Financial Infrastructure: The central bank and major commercial bank head offices represent high-value targets. Physical security reviews following Bangladesh Bank's 2016 cyber-heist incident heightened awareness of all physical security requirements at financial institutions.

International Hotels: Major international hotel chains in Dhaka operate vehicle access control at gate level, with rising bollards or road blockers at main drives, following global brand security standards implemented post-2015.

Industrial and Export Zone Infrastructure: BEPZA export processing zones and large private industrial parks manage significant truck traffic requiring controlled access, where automatic road blockers improve operational efficiency while maintaining security.

Operational Integration: HVM and Your Security Team

HVM hardware alone is not a complete solution. Your security team's procedures must complement the physical infrastructure:

Vehicle approach management: Security staff must direct vehicles to approach slowly and stop at a defined point while credentials are verified. Tense approach lanes with zigzag geometry physically prevent high-speed runs.

Stand-off distance: Maintain clear space between the vehicle barrier line and the protected building. Even with a certified barrier in place, a vehicle explosion at the barrier line can cause blast and fragmentation damage. International guidelines recommend a minimum standoff of 30 metres for the highest threat levels.

Vehicle search procedures: Where credible threat levels justify it, search vehicles before admitting them past the final barrier. Use under-vehicle search mirrors or automated under-vehicle scanning systems.

Hostile reconnaissance awareness: Attackers typically conduct reconnaissance before an attack. Train security staff to log and report unusual vehicle behaviour — repeated slow passes, parked vehicles observing entrances, photography of security infrastructure.

Get Expert Help

HVM planning requires expertise in threat assessment, structural engineering, and operational security that goes beyond standard equipment supply. SSAL provides a structured HVM consultancy service — from initial threat assessment through barrier specification, civil engineering coordination, and final commissioning.

We work with crash-test-certified road blockers, bollard systems, and wedge barriers, and we have experience integrating HVM infrastructure with access control and CCTV systems at Bangladesh's most demanding security environments.

Talk to Our Expert — contact SSAL today for a confidential HVM site assessment. We help you identify your real threat level and design a proportionate, cost-effective solution.