When a police officer is following you and wants you to stop, they'll flash the vehicle's headlights and signal with the left indicator. You should stop in a safe place as soon as possible.

Plan well ahead before overtaking. Be aware that a speed limiter may cause you difficulties when overtaking another vehicle, particularly when climbing a hill.

You must take 35 hours of training every five years to maintain your Driver CPC. This can be done at any time during the five years: all at once or split into sessions of at least seven hours each. The penalties for non-compliance are the same as those for driving without a licence.

In congested tunnels, you should always obey the instructions given by variable message signs and tunnel officials. Listen out for radio announcements and observe the road signs and signals. Keep your distance from the vehicle in front.

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.

You should always leave a safety margin between your vehicle and the one in front. This gap will give you a better view of the road ahead. It will also allow you time to react if the traffic in front changes speed or direction.

Most incidents happen as a result of a lapse in concentration. Don't let this happen to you. If you start to feel tired, you won't perform as well as you should. Your reactions will slow down, and your anticipation and judgement of hazards will become flawed. If you feel tired, stop and rest as soon as it's safe to do so.

A red cross above the hard shoulder means that it's closed as a running lane and should only be used for emergencies or breakdowns. At busy times, the hard shoulder may be used as a running lane; the red cross will then be replaced by a mandatory speed-limit sign.

The choice of restraint will depend on the load. For example, ropes are unsuitable for loads such as steel plates, as there's a danger of sharp edges shearing the ropes. For steel plates, chains must be used with a suitable tensioning device.

Moisture in the air condenses as the air pressure increases. This moisture can be transmitted around the braking system and is especially dangerous in cold weather. It can lead to ice forming and blocking the valves and pipes.

Some medicines can have side-effects that affect your driving. Ask your doctor whether you'll be safe to drive while taking the medicine that's been prescribed.

If you feel the onset of tiredness, you need to take a break. This might be at a motorway service station, but if there isn't one nearby you'll need to leave at the next exit and find a safe place to stop and rest.

During high winds, one of the lanes on a high bridge might be closed to traffic to create a buffer lane. The buffer lane is kept free to prevent vehicles from being blown into the path of other road users in the next lane. The closure of this lane may cause traffic congestion and delay.

If you're disqualified from driving because you were two-and-a-half times over the legal limit, you'll be classified as a high-risk offender. Before you can regain your licence, you'll have to satisfy the Driver and Vehicle Licensing Agency (DVLA) that you don't have an alcohol problem.

It's important to know what's happening behind as well as ahead. Your mirrors must always be clean and properly adjusted.

Current legislation requires all operators to set up an 'effective system' to help prevent the carriage of illegal immigrants. This should include vehicle security and checking using a checklist. Failure to do this will incur penalties.

Before leaving the cab, it's very important to secure the vehicle by applying the parking brake. After leaving the cab, apply the trailer parking brake.

The headroom under bridges in the UK is at least 5 metres (16 feet 6 inches) unless marked otherwise. However, this might refer only to the highest point of an arch. If your vehicle hits a bridge, you must report the incident to the police. If a railway bridge is involved, you must also report it to the railway authority.

A triangular sign is a warning sign. Knowing this, you can prepare for the hazard ahead.