When giving cardiopulmonary resuscitation (CPR), continue until the casualty is breathing unaided or until medical help arrives. Don't give up. Look for signs of recovery and check the casualty's pulse. Avoid moving them unless it's necessary for their safety.

After leaving a motorway or when using a link road between motorways, your speed may be higher than you realise: 50 mph may feel like 30 mph. Check the speedometer and adjust your speed accordingly. Some slip roads and link roads have sharp bends, so you'll need to slow down.

If you're towing a caravan or trailer, you mustn't use the right-hand lane on a motorway with three or more lanes, except in certain circumstances, such as when there are lane closures.

Watch out for emerging vehicles, as the driver's view may be obscured at some junctions. If a vehicle pulls out and you're not sure whether the driver has seen you, slow down and be prepared to stop. Be tolerant and don't sound the horn in anger.

Fog lights are brighter than normal dipped headlights. If the weather has improved, turn them off to avoid dazzling other road users.

High-intensity rear fog lights are to be used when fog has seriously reduced visibility. Using them at any other time runs the risk of dazzling drivers behind. A warning light will show on the dashboard to indicate when your rear fog lights are on. You should know the meaning of all the lights on your dashboard and check them before you move off and as you drive.

If you have to park your vehicle in foggy conditions, it's important that it can be seen by other road users. Try to find a place to park off the road. If this isn't possible, leave it facing in the same direction as the traffic. Make sure that your lights are clean and that you leave your parking lights switched on.

When driving on snow or frozen surfaces, your tyres will have very little grip. To avoid losing that grip, you'll need to accelerate, steer and brake very gently.

Never obstruct drivers who wish to pass. Speeding up or driving unpredictably while someone is overtaking you is dangerous. If someone overtakes and pulls into the gap in front of you, drop back to maintain a two-second gap.

Properly timed signals tell other road users what you intend to do. When you're turning right at a roundabout, signal left just after passing the exit before the one you wish to take. This helps drivers behind and also those waiting to join the roundabout.

Any vehicle stopped on the hard shoulder of a motorway is at risk from passing traffic. For this reason, don't attempt to make repairs to your vehicle while it's on the hard shoulder. Make your way to the nearest emergency telephone to call for assistance.

Should the parking brake fail, the use of first gear will help to prevent the vehicle from rolling backwards. By turning the front wheels to the right, they'll travel the shortest distance before running against the kerb. This will reduce the potential for the vehicle to move any further.

Before stopping, check the mirrors to see what's happening behind you. Also assess what's ahead and make sure you give the correct signal if it will help other road users. If you have to stop in an emergency, you may not always have time to use the mirrors.

All motor vehicles are fitted with a horn; its purpose is to warn other road users of the vehicle's presence. You mustn't sound the horn between 11.30 pm and 7.00 am in a built-up area or when you're stationary, except when another road user poses a danger.

Sooner or later, another driver will do something that affects you. This can result in a range of feelings such as anger or fear, and you may struggle to concentrate on your driving. If you find yourself in this situation, it's best to look for a safe place to stop and give yourself time to recover. Any form of retaliation will lead to increased risk.

There are marker posts at 100 metre intervals along the hard shoulder of a motorway. The markers direct you to the nearest emergency telephone, so follow them if you've broken down.

If you intend to overtake on a two-way road that has three lanes, you must consider that approaching traffic could be planning the same manoeuvre. When you've considered the situation and have decided it's safe, indicate your intentions early. This will show the approaching traffic that you intend to pull out. Some of these roads have solid white lines marked to allow for overtaking in one direction only, usually for uphill traffic.

Signals should be cancelled soon after use. If a driver is unsure of the location of a junction or destination, they may signal earlier than normal while looking for their turn. Don't attempt to overtake, as they may turn suddenly.

It can be worrying if the driver behind hasn't left enough room to stop if you have to brake hard - for example, in an emergency. Driving defensively, you should give yourself a greater safety margin by easing back from the vehicle in front. If an emergency arises, you'll be able to slow down more gradually, giving the driver behind more time to respond.

If you wish to overtake a long vehicle, stay well back so that you can see the road ahead. Don't
-get too close to the vehicle, as this will restrict your view of the road ahead
-get impatient; overtaking on a busy road calls for sound judgement
-take a gamble; only overtake when you can see that you can safely complete the manoeuvre.