On a motorway, it's best to use a roadside emergency telephone so that the emergency services are able to locate you easily.

Air suspension will increase passenger comfort and can also help to reduce wear on road surfaces - which is why it's also known as 'road-friendly suspension'.

It's an offence to leave your vehicle unattended at any time without applying the parking brake.

It's important to use a low gear and keep the engine speed high to prevent water from entering the engine through the exhaust system. In these circumstances, it may be necessary to slip the clutch to keep the road speed as low as possible.

A kneeling bus uses air suspension to lower the front entrance, giving easier access for passengers. This is especially helpful for people who have difficulty climbing steps, are disabled or use wheelchairs. Make sure you're properly trained to use this equipment.

Always allow plenty of time for your journey, in case of unforeseen problems such as punctures, breakdowns, road closures or diversions. You'll feel less stressed and less inclined to take risks if you're not under time pressure.

Always look out for road signs, but be especially aware of those that refer to large or heavy vehicles. Get into the habit of checking for signs at junctions. There might be an indication on the junction layout sign. Before you turn, make sure that the road you're using doesn't have any restrictions for the vehicle you're driving.

Make sure that your vehicle displays all the information required by law (the 'legal lettering'): the seating/standing capacity and the locations of the emergency exit, fuel cut-off switch and electrical isolator.

Your vehicle will handle very differently when it's full, compared with when it's empty. Having 75 passengers on board would increase the weight of the bus by about 5 tonnes - and the passengers may also have luggage. It will take longer to build up speed and the vehicle will be more difficult to stop. Forward planning and controlled braking will be required to allow for this extra weight.

Only use your horn to warn people of your presence when they may not have seen you. Don't use it to greet others, to show impatience, or to give or claim priority. Your horn mustn't be used between 11.30 pm and 7.00 am in a built-up area, or when your vehicle is stationary, unless another vehicle poses a danger.

The amber light means stop. You may only go on if the light changes to amber after you've crossed the stop line or when you're so close to the line that stopping might cause a collision. The amber light is followed by the red light. You must wait behind the stop line until the green light shows.

There are times when, due to the size of your vehicle, you'll have to take up part of another lane. If you need to do this, make sure that you use effective observation all around. Be aware that other road users might not understand the reasons for your position on the road. You should signal your intentions and take up your position in good time.

When overtaking with a long vehicle, it's very important to be aware of the position of the road user you're passing. Check the nearside mirror to make sure you've passed safely before returning to the left. Be especially careful when overtaking motorcyclists, as they may be affected by the draught from your vehicle.

Some vehicles are fitted with an audible warning that sounds when the vehicle is reversing. This is an effective way to warn pedestrians and other road users of a reversing vehicle, but it doesn't take away the need to use effective observation all around your vehicle before and while you're reversing. Don't use the device in built-up areas between 11.30 pm and 7.00 am. Have consideration for the residents and don't disturb them with excessive noise.

After an incident, passengers who aren't obviously injured may be suffering from shock. Reassure them and keep them warm. Don't give them anything to eat or drink. Call the emergency services and keep yourself and any injured passengers calm until professional help arrives.

You should always check your nearside mirror before any change of direction. Be alert for cyclists and motorcyclists who don't realise the potential danger involved in trying to squeeze through on your nearside when you're waiting at a junction.

Vehicles overtaking in the right-hand lane may return to the centre lane when they've finished their manoeuvre. You should look for this before starting to pull out. Don't rely on the size of your vehicle to claim right of way.

The driver of a passenger-carrying vehicle needs to know the vehicle's limits. These include its weight, height, width and length, and its seating and standing capacity. The unladen weight should be displayed on the nearside of the vehicle.

Closed curtains on large empty vehicles can hold the wind. Strong side wind can blow a semi-trailer off course and, in severe cases, can blow the whole vehicle over onto its side. To reduce the risk of this happening, you should tie the curtains open.

The flashing amber lights are switched on to warn you that children may be crossing near a school. Slow down and take extra care as you may have to stop.

DVSA or the police can order an immediate prohibition. The vehicle may be immobilised and you won't be able to drive it until the faults have been rectified. Details are notified to the traffic commissioner. Never use a vehicle that you know is faulty.

On the approach to many tunnels, a board will indicate a local channel or radio frequency that you should tune into. This should give a warning of any incident or congestion in the tunnel ahead. Severe loss of life has occurred in tunnel fires. Getting advance warning of any problems ahead will help you to take appropriate action in good time.

This sign is used to warn of overhead electrified cables and is usually accompanied by a plate indicating the safe height limit.

It's illegal to use a hand-held phone while driving. When you've stopped in a safe place, you can concentrate on your call or message. Using a phone while driving means you won't have full control of your vehicle. This could result in a collision, with serious or even fatal consequences.

Because small wheels need to rotate faster, their tyres are more likely to overheat on long journeys at speed. Make sure you check them when you take rest stops.

Most diesel engines have glow plugs to preheat the combustion chambers, so helping the engine to start when it's cold. When the ignition is switched on, the preheat warning lamp will show and the glow-plugs will rapidly heat up. In cold weather, the starter should only be operated when the glow plugs reach operating temperature and the warning light goes out.

With a front-tyre blow-out, you won't be able to steer properly. Keep a firm hold of the steering wheel and slow gradually to a stop. Don't brake hard or steer sharply.

Giving wrong signals causes uncertainty and confusion to other road users. Only give signals that are relevant and timed to match your actions.

Look out for restrictions on long vehicles. Length restrictions are found where there isn't much room to turn (for example, in a tunnel) or where there's a risk of grounding.

Drivers are required to take 35 hours of training every five years to maintain their Driver CPC. This can be split into shorter sessions of at least seven hours each. These can be spread over the five years, so effectively one day's training is taken each year. The penalties for non-compliance are the same as those for driving without a licence.