“Heavy vehicle inspection” can mean two different things: an in-service roadworthiness check, or an engineering assessment of a modification. The evidence and approval outcome differ. Make sure the booking identifies which one the vehicle needs.

In-service roadworthiness inspections

The NHVR’s National Heavy Vehicle Inspection Manual provides inspection criteria for the condition of vehicles in service. Items include the condition and operation of brakes, steering, suspension, wheels and tyres, lights, body and chassis. An in-service inspection does not by itself certify newly fitted equipment or engineering changes.

Modification approval and VSB 6

Vehicle Standards Bulletin 6 (VSB 6) is the technical code for common heavy vehicle modifications. A modification assessment may require inspection of the completed work together with calculations, drawings, component information and evidence that the vehicle continues to meet applicable standards. Some complex changes follow a different NHVR approval path.

CVC undertakes engineering assessment and certification for modifications such as body fitment, wheelbase and chassis changes, seating, brakes, ratings, cranes, tow equipment and tippers, subject to the applicable approval path and signatory authorisation. See our heavy vehicle modifications and truck equipment pages for service details.

What to have ready

• Vehicle identification, registration status and existing ratings.
• A complete list of modifications and the outcome requested.
• Drawings, installation instructions and component certificates where available.
• Photos of work before it was covered, especially chassis, mounting and anchorage work.
• The finished weight and axle loads when relevant.

Tell CVC about every modification before the appointment, especially when labels or supporting paperwork need to be prepared. We can then identify the likely codes and missing evidence before attending. Contact CVC with the vehicle details and modification list.