As a professional driver handling heavy goods vehicles (HGVs), buses, vans, or vehicles with heavy loads and trailers, you must understand the profound impact of size and weight on vehicle handling, braking, and how you interact with other road users.
1. Blind Spots and Turning (Rules 221 & 222)
Large vehicles need extra room. You must be extremely careful at junctions and roundabouts.
- β’Turning: Large vehicles may have to use the whole width of the road to make a turn. Other drivers must not pull up alongside them when they are turning. If you are driving a large vehicle, ensure you check your mirrors and blind spots carefully for cyclists and motorcyclists who may be filtering through traffic on your inside.
- β’Separation Distance: Because large vehicles block the view of drivers behind them, following vehicles should pull back to increase their separation distance. This improves their ability to see and plan ahead.
- β’Speed Limiters: Many large vehicles are fitted with speed limiting devices which strictly restrict their maximum speed to 56 mph (90 km/h), even when driving on a motorway where the national speed limit is 70 mph.

2. Overtaking and Being Overtaken (Rule 164)
Overtaking a large vehicle is more difficult and takes considerably longer.
- β’If you are driving a large or slow-moving vehicle and a long queue of traffic builds up behind you, you MUST check your mirrors frequently, and if necessary, pull in where it is safe to let the faster traffic pass.
- β’When towing, the extra length will significantly affect overtaking and manoeuvring, and the extra weight will affect both braking and acceleration.
3. Loading and Securing Goods
Whether you are driving an HGV or a panel van, ensuring your load is safe is a legal requirement.
- β’Load Distribution: Load your goods evenly throughout the cargo area, with the heaviest items at the bottom. You MUST NOT overload individual axles.
- β’Bulkheads and Restraints: If your van does not have a bulkhead, the contents of your cargo area could end up in the cab in the event of a collision if they are not secured properly. Use appropriate restraints to secure your load, like netting and heavy-duty straps.
- β’Towing Mirrors: If your vehicle is narrower than your trailer or load, or your trailer/load completely obstructs your rearward view, then towing mirrors MUST be used.

4. Vehicle Markings and Projections
Large vehicles must display specific highly visible markings on the rear to warn other road users.
- β’Large Goods Vehicle Rear Markings: Motor vehicles over 7,500 kg maximum gross weight and trailers over 3,500 kg maximum gross weight MUST be fitted with distinctive red and yellow reflective rear markings.
- β’Projection Markers: If a load or equipment (e.g., a crane jib) overhangs the front or rear of the vehicle by more than 2 metres, both side markers and end markers MUST be explicitly fitted to the load.
5. Dangerous Goods (ADR) and Incidents (Rules 284 & 285)
Special, strict rules apply to vehicles carrying hazardous materials.
- β’Markings: Vehicles carrying dangerous goods in packages will be marked with plain orange reflective plates. Road tankers and vehicles carrying tank containers of dangerous goods will have specific hazard warning plates (showing diamonds for flammable, toxic, corrosive, etc.).
- β’In the event of an incident: If an incident involves a vehicle containing dangerous goods, you MUST:
- β’switch off engines and DO NOT SMOKE.
- β’keep well away from the vehicle and do not be tempted to try to rescue casualties, as you yourself could become one.
- β’call the emergency services (999 or 112) and give them as much information as possible about the labels and markings on the vehicle.
- β’DO NOT use a mobile phone close to a vehicle carrying flammable loads.
