All HGVs are subject to strict regulations and requirements set by the Driver and Vehicle Standards Agency (DVSA). These vehicles must pass an annual government-mandated roadworthiness test, as well as meeting certain environmental standards. In order to be classed as an HGV, the vehicle must weigh over 7.5 tonnes. This weight is based on the Gross Vehicle Weight Rating (GVWR), which includes the combined weight of the vehicle, its load, and any passengers.