Heavy Duty Vehicle : Any motor vehicle with a kerb weight of more than 4000kg or gross vehicle weight greater than 7500kg, which is specifically designed to pull a trailer or to carry cargo.
International Association of Oil & Gas Producers OGP, Land Transportation Safety Recommended Practice (Appendix 2- Glossary), Report No. 365, London, UK 2005. www.ogp.org.uk, (O&G Transp - Brit) {97}