Look out for signs giving you advance warning of height restrictions. As a professional driver, you should always know the height of your vehicle or load. If you aren't sure of the safe height, stop and check.

The forces acting on a lorry will try to move it in a straight line as it enters a bend. The greater the weight, the greater the force. If you're going too fast, there's a danger that you could lose your load or tip over.

Leaving the filler cap off, or not properly securing it, could result in a spillage of diesel onto the road. Because diesel is slippery, this would be a major hazard, so make sure to correctly secure the filler cap after use.

Warn other traffic of the incident, without putting yourself or others at risk. Once the danger of further collisions is dealt with, call the emergency services. While you're waiting for them to arrive, keeping casualties or witnesses calm is important, but never offer a cigarette because of the risk of fire.

You can reduce the chance of a breakdown with routine maintenance and regular checks on your vehicle.

Expect a motorcyclist who makes a quick glance over their shoulder to be changing direction. They should do this before turning. By observing this, you'll get an early clue of their intention.

While driving on a building site, bricks, mud or other debris can become lodged between a lorry's double rear wheels. When you leave the site and increase your road speed, anything lodged between the tyres could be thrown out. This flying debris can be a hazard for drivers of following vehicles and can create dangerous road conditions, especially for motorcyclists.

Even though the warning light is showing, there may be sufficient pressure to release the parking brake. However, you mustn't do this, because there may not be enough air pressure to operate the service brake.

The red studs on your left indicate the edge of the hard shoulder, while the white studs are used between the lanes. Using more than one reference point will help you to be certain of your position.

This sign is placed on sections of road where overtaking would be dangerous. There'll often be a plate underneath the sign, telling you how far the restriction extends. You mustn't overtake until you pass another sign cancelling the restriction.

There are usually four coloured bands on the rev counter: green, amber, blue and red. The blue band will allow you to make the best use of engine braking. Try to keep in this band when going down a steep hill.

Avoiding busy times means that you're not adding needlessly to traffic congestion. Other advantages are that you'll use less fuel and you may have an easier journey, making you feel less stressed.

Oil is vital for lubrication of the engine. It should be checked regularly and topped up as necessary. You should always check your engine's oil level when the engine is cold and your vehicle is parked on the level.

If you're following cyclists onto a roundabout, be aware that they might not take the exit you expect. Cyclists approaching in the left-hand lane could be turning right but may not have been able to get into the right-hand lane. Give them plenty of room.

When an emergency arises, pull onto the hard shoulder and use the emergency telephone to report your problem. You'll be connected to an operator, who will put you through to a breakdown service. Never cross the carriageway or a slip road to use a telephone.

Always indicate your intentions in good time; this will allow others time to alter their speed and course if necessary. Always check your blind spots before changing lanes.

Concentration and good judgement are needed to be a good, safe driver. You're strongly advised not to drink any alcohol before driving. Alcohol can stay in your system for 24-48 hours, so you should also consider your intake the day and night before driving.

The faster the traffic is moving, the greater the distance that needs to be kept between vehicles to maintain safety margins. If you find another vehicle driving too close behind you, gradually reduce your speed to increase your distance from the vehicle in front. You'll then be able to brake more gently when you need to, reducing the likelihood of the lorry behind running into the back of your vehicle.

From your raised driving position, you may not be able to see the area directly in front you. The Class VI (Cyclops) mirror on the front of your vehicle can reveal pedestrians, cyclists and motorcyclists who would otherwise be hidden from view. Check this mirror carefully before moving off, especially at pedestrian crossings and in stop/start city traffic.

If you've been convicted of drink- or drug-driving, statistically you're a risk to yourself and others on the road. For this reason, when you're able to drive again, insurance companies may charge you a high premium to insure your vehicle.

The symbols on the back or side of a lorry should show the type of material that the vehicle will normally be carrying.

When transporting frozen food, you need to know how to operate your refrigeration unit correctly. It's also essential that you're aware of correct hygiene procedures when handling food.

Switch off your fog lights when fog starts to clear and visibility improves to more than 100 metres (328 feet). Don't leave your fog lights on when the fog has cleared, because they can cause unnecessary glare or distraction for other drivers.

When driving large vehicles, windscreen pillars and large mirrors can easily create blind spots as you look left and right at junctions. Altering your body position slightly while looking into the new road can give you an improved view of the traffic. If in doubt, look again and reassess the situation. Don't take chances.

Make certain that your filler caps are properly closed, so that you don't spill fuel as you drive along the road.

By planning your journey to avoid busy times, you'll avoid the build-up of traffic that often occurs.

If you see this sign, be aware that there's a danger of grounding. This can happen where there's a pronounced bump in the road, such as at a level crossing or a hump bridge.

You have priority over vehicles from the opposite direction. However, if a vehicle approaching from the opposite direction isn't going to stop, you should slow down and give way to avoid confrontation or an incident.