There's a particular risk when driving between 2 am and 7 am. This is when the 'body clock' is programmed for sleep in most people. There's another, smaller, dip between 2 pm and 4 pm. If you feel that tiredness is affecting your ability to drive, stop in a safe place and rest.

This traffic sign means no stopping on the main carriageway at any time, not even to set down passengers. However, you may stop in a lay-by.

Red Routes operate in many busy cities and are designed to ensure the route has no obstructions to cause delays during peak periods. Road signs and red road markings identify roads where Red Route waiting and loading restrictions apply.

Vehicles such as motorcycles, bicycles and caravans could be blown off course by strong winds. You should be aware that your vehicle could cause additional buffeting when you overtake, so allow them plenty of room.

When turning right onto a dual carriageway, don't stop in the gap in the central reservation unless your vehicle will fit in the gap without any overhang. When it's busy, consider turning left and using a roundabout further up the road so you don't have to cross the central reservation.

It's more difficult to judge speed and distance accurately in the dark. Darkness can also hide bends and dips in the road. Plan ahead, and be sure that you have time and space to complete your overtaking safely.

While you're using a phone, your attention will be divided between the call and the road. This means you're unable to take in all that's happening around your vehicle. You need to be concentrating on your driving all of the time, and especially when dealing with a hazard.

As well as a height restriction, the tunnel may have a restriction on the available width of headroom for high vehicles. The advance warning gives you the opportunity to find another route if your vehicle is too high or wide to drive through the tunnel.

Under EU rules, the maximum number of hours that you can drive in any two consecutive weeks is 90 hours. These don't have to be split evenly, but the total amount of driving time in any one week mustn't exceed 56 hours. Don't exceed your driving hours; heavy fines can be given to drivers who break the law.

The flashing amber light allows pedestrians already on the crossing to get to the other side before a green light shows to the traffic. Be aware that some pedestrians, such as elderly people and young children, need longer to cross. Let them do this at their own pace.

If you're carrying a load that consists of loose materials, it must be covered by suitable sheeting. You mustn't risk losing any part of your load. This could cause damage or injury to other road users, and you would be responsible.

Sometimes other road users disobey the rules or make errors of judgement. Try to accept this calmly and learn from their mistakes.

When you need to drive close to the kerb, be aware of the dangers.

• Pedestrians may step off the kerb.
• The nearside mirror may be at a pedestrian's head height.
• Cyclists may be tempted to pass you on your left if you're driving slowly in congested conditions.

Potholes and raised drain covers in the road can unsteady a motorcyclist. They may suddenly swerve to avoid these uneven surfaces. Watch out at places where the road is in poor condition and this is likely to occur.

When the roads are wet, have consideration for pedestrians walking or standing near the kerb.

Vehicles that are used to carry children to and from school will be travelling at busy times of the day. Be prepared for a vehicle with this sign to make frequent stops. It might pick up or set down passengers in places other than normal bus stops.

Leaking fuel can make the road extremely slippery. Look out for this, particularly on roundabouts.

Look for and obey traffic signs. Disobeying or not seeing a sign could be dangerous. It may also be an offence for which you could be prosecuted.

The motorcyclist might be turning right, changing direction or unsure of their destination. Stay behind until the rider has made a move or you're sure you can pass safely. Don't intimidate them by moving too close.

A bus equipped with a speed limiter must also be fitted with a plate showing the speed setting. This must be fitted in an obvious position, where it can be clearly seen.

Select an appropriate gear in good time and, if your vehicle has a dashboard-mounted lever, apply the endurance brake (retarder) in stages. Braking too much, too soon may result in locking your drive wheels.

Workshop manuals give detailed technical advice about the servicing, maintenance and repair of your vehicle. They're essential for anyone who wants to service or repair their own vehicle.

This sign gives a clear instruction. You should prepare to negotiate a left-hand turn.

An endurance brake can help to control your speed on long downhill slopes without using the service brake. Reducing the use of the service brake helps to prevent the brakes from overheating and reduces the risk of brake fade.

Side markers must be displayed if your load is over 2.9 metres [9 feet 5 inches] wide. Make sure that they're clearly visible, at both the front and rear, and that they indicate the actual width of the projection.

Allow horse riders to enter and exit the roundabout in their own time. Don't drive up close behind or alongside them; this could disturb the horse.

Wind deflectors lower a vehicle's wind resistance. The vehicle therefore requires less energy to drive it forward, and this reduces its fuel consumption. Ecosafe driving techniques, correct tyre pressures and proper maintenance also help to maximise fuel efficiency.

Gently tilt the unconscious person's head to clear their airway. Check for at least 10 seconds that the casualty is breathing by looking for movement in the chest, listening for sounds and feeling for breath on your cheek. Get someone to call the emergency services.