CLOCS Compliant Vehicle Safety Systems

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CLOCS — Construction Logistics and Community Safety — is the construction industry framework that determines which transport operators can serve major UK developments. HS2, Crossrail, Thames Tideway, the Lower Thames Crossing, and most major commercial developments in London require CLOCS-compliant vehicles for any logistics movement. Without CLOCS compliance, a haulier cannot operate on the contract regardless of how well-equipped or well-managed their fleet otherwise is.

CLOCS doesn’t define its own camera and sensor specification — it references FORS Silver as the minimum vehicle standard. So CLOCS compliance for the vehicle side of the standard means meeting the FORS Silver camera, sensor, monitor, and audible warning specification. The contractual enforcement is what differs: CLOCS contracts terminate the haulier’s access to the site if vehicles aren’t compliant, regardless of FORS audit cycles.

Why CLOCS matters

Three factors make CLOCS compliance commercially critical for transport operators serving construction:

• Contract access. Most major UK construction projects make CLOCS compliance a contract condition. Hauliers without CLOCS-registered vehicles cannot bid, can’t be subcontracted to, and can’t operate on site. The financial impact of non-compliance is loss of contract access, not a regulatory fine.
• Construction Logistics Plans. Local planning authorities increasingly require Construction Logistics Plans (CLPs) for major developments — and CLPs typically specify CLOCS compliance as a vehicle standard for all logistics traffic. The compliance requirement flows from the planning consent, not from the operator’s discretion.
• Public safety record. CLOCS was developed in response to the disproportionate number of cyclist and pedestrian fatalities involving construction logistics vehicles in London. The standard’s existence reflects a documented public safety problem and represents an industry-wide commitment to addressing it.

Featured products in our CLOCS-compliant kits

CLOCS Standard — what it actually requires

CLOCS Standard V5 (effective March 2025) consolidated previous versions and aligned with FORS Silver+ for vehicle requirements. The vehicle-side requirements are:

• Nearside camera — wide-angle, IP69K, 1080p HD (FORS Silver standard)
• Rear camera — rear coverage (FORS Silver standard on rigid vehicles over 7.5T)
• BSIS-type sensor on the nearside (UNECE R151 or equivalent)
• In-cab monitor — 7-inch minimum, high-brightness, anti-glare
• External audible left-turn warning on indicator activation
• Reversing alarm — preferably white-sound for community impact management
• Side underrun protection on the trailer (where applicable)
• Cyclist warning signage on the trailer rear and side

The driver-side requirements (separately): cyclist awareness training, drugs and alcohol policy, and FORS Silver Driver requirements where applicable.

CLOCS-compliant kit specification

Standard CLOCS Kit (rigid HGV)

• BW690 Side Camera — nearside CMS
• BWBSIS Sensor — UNECE R151 BSIS
• BW701 7″ Monitor — 7-inch FORS-compliant
• LTAbgt Left Turn Alarm — external audible warning
• EA5050 Eco Alarm — white-sound reversing alarm
• BWMS585E MDVR — multi-channel evidence MDVR

Installation time: ~4 hours per vehicle. Documentation: CLOCS-aligned compliance certificate per vehicle.

CLOCS Kit + DVS PSS (London-operating)

For vehicles operating both on construction logistics contracts and in Greater London. Adds DVS PSS-specific MOIS to the standard CLOCS kit.

• All standard CLOCS kit components
• BWMOIS — UNECE R159 MOIS for DVS PSS compliance

Installation time: ~5 hours per vehicle.

CLOCS Articulated Kit

For articulated configurations with trailer-mounted cameras and FORS V7 (January 2025) sensor positioning.

• Standard CLOCS kit on tractor (with V7 BSIS positioning)
• Trailer rear camera with BWTX/RX wireless
• BW706 wireless 7″ monitor in cab
• Susie connector for trailer power
• Side underrun protection (manufactured separately, not Backwatch)
• Cyclist warning signage

Installation time: ~5–6 hours per articulated combination.

CLOCS vs FORS — what’s the difference?

Aspect	CLOCS	FORS
What it is	Construction industry framework	Fleet operator accreditation scheme
Mandatory?	Contractually mandatory on construction projects	Voluntary nationally; contract-required where specified
Vehicle standard	References FORS Silver	Bronze / Silver / Gold tiers
Driver standard	CLOCS-specific cyclist awareness	FORS Silver Driver / Gold Driver
Enforcement	Contract termination by client	FORS audit + accreditation status
Geography	UK-wide (where construction projects specify)	UK-wide

For most fleet operators, CLOCS compliance and FORS Silver+ are pursued together — the camera and sensor specification overlaps almost entirely, so a single installation satisfies both frameworks. The differentiator is the documentation: CLOCS requires evidence per contract; FORS requires evidence per audit cycle.

CLOCS Standard V5 (March 2025) updates

CLOCS V5 made several updates that affect fleet operators:

• Aligned with FORS Silver V7 — including the FORS V7 sensor positioning rules for articulated configurations
• Enhanced reporting requirements — incident reporting expectations strengthened, with construction project reporting frameworks integrating CLOCS data
• Driver training updates — cyclist awareness module updated to reflect post-2024 collision data and emerging vulnerable road user patterns (e-bikes, e-scooters)
• Compliance verification — increased emphasis on demonstrable evidence of compliance, not just self-declaration

By construction project context

• Major infrastructure (HS2, Lower Thames Crossing, etc.): Full CLOCS + FORS Silver, often with project-specific additions (driver vetting, vehicle livery requirements, route compliance)
• London commercial developments: CLOCS + DVS PSS; FORS Silver minimum, FORS Gold preferred for major contractor relationships
• Regional construction projects: CLOCS + FORS Silver; specific kit may vary based on the principal contractor’s standard
• Refuse and waste projects (construction phase): CLOCS + WISH WASTE-04; integrated kit covering both
• Civil engineering and groundworks: CLOCS + appropriate engineering controls under MHSWR for site operations (proximity sensors, audible warnings)

Installation and support

• On-site fitting across England and Wales — typical 4–5 hours per vehicle for standard CLOCS kit
• Weekend fitting available — at no extra cost
• 2-year product warranty on cameras, sensors, monitors, and alarms
• CLOCS-aligned compliance certificate per vehicle — identifies which CLOCS / FORS Silver requirements each component satisfies
• Fleet compliance register for multi-vehicle installations
• FORS V7 (January 2025) sensor positioning applied to articulated configurations

Frequently asked questions

Is CLOCS the same as FORS?

No, but they overlap significantly. CLOCS is a construction industry framework that defines safety standards for construction logistics; FORS is a national fleet operator accreditation scheme. CLOCS references FORS Silver as its vehicle standard, so meeting FORS Silver vehicle requirements automatically meets the vehicle side of CLOCS. The differences: CLOCS is contract-enforced (no audit cycle, just project-by-project verification); FORS has a formal audit and accreditation cycle. For most fleet operators serving construction logistics, both are pursued in parallel — the same kit installation satisfies both standards.

Can I be CLOCS compliant without being FORS Silver accredited?

The vehicle equipment specification is the same, so the vehicles can meet the CLOCS technical requirements without FORS accreditation. However, most CLOCS contracts require evidence of compliance — and FORS Silver accreditation is the most common evidence accepted. Without FORS accreditation, the operator must produce alternative documented evidence per contract, which typically takes longer to produce and accept. In practice, most operators serving construction find FORS Silver is the most efficient route to CLOCS compliance.

Does CLOCS V5 require existing fleets to upgrade?

CLOCS V5 (March 2025) maintains continuity with V4 vehicle requirements but aligns with FORS V7 sensor positioning. Fleets with FORS-V7-compliant equipment are already CLOCS V5-aligned on the vehicle side. Pre-V7 articulated installations should be reviewed against V7 sensor positioning. The driver-side updates in V5 (cyclist awareness training) require fresh training cycles for drivers, not equipment changes.

What happens if a CLOCS vehicle is found non-compliant on site?

The principal contractor typically suspends the vehicle from site access until compliance is restored. Repeated non-compliance can result in the operator being removed from the project’s approved supplier list. The financial impact compounds: the lost work for that vehicle plus the reputational impact on the operator with the principal contractor. Some major projects (HS2, Crossrail) maintain shared databases of operators’ compliance history that affect future project access.

Are CLOCS-compliant kits more expensive than FORS Silver kits?

The technical specification is the same, so the kit cost is the same. The differences in price come from: documentation requirements (CLOCS contracts may specify more detailed per-vehicle records), driver training (CLOCS-specific modules), and ongoing compliance reporting. For most fleet operators, the equipment cost is identical to a FORS Silver installation; the additional cost is in the operational documentation and driver development.

Does CLOCS apply outside London?

Yes. CLOCS is referenced by construction projects nationally — major infrastructure projects across the UK (HS2 phases, Lower Thames Crossing, regional regeneration schemes), London commercial developments, and any project where the construction logistics plan specifies CLOCS. The framework was developed by Transport for London but its adoption is UK-wide. London operations also need DVS PSS in addition to CLOCS; outside London, CLOCS alone is the typical contract requirement.

How does CLOCS interact with the planning system?

Local planning authorities increasingly include CLOCS compliance as a condition of construction phase planning consent — particularly in London but also in major regional cities (Birmingham, Manchester, Leeds, Bristol). The Construction Logistics Plan (CLP) submitted with the planning application typically specifies CLOCS-compliant vehicles for all logistics traffic. This means that even if the principal contractor doesn’t directly require CLOCS, the planning consent for the development requires it — and compliance flows through the contracting chain.