You may pass slower vehicles on their left while travelling along a one-way street. Be aware of drivers who may need to change lanes and may not expect faster traffic passing on their left.

The road will be very wet and spray from other vehicles will reduce your visibility. Tyre grip will also be reduced, increasing your stopping distance. You should at least double your separation distance to make sure you can stop safely in the space you've allowed.

Don't overtake if there’s a possibility of a road junction, bend or brow of a bridge or hill ahead. There are many hazards that are difficult to see in the dark. Only overtake if you’re certain that the road ahead is clear. Don’t take a chance.

The purpose of a box junction is to keep the junction clear by preventing vehicles from stopping in the path of crossing traffic. You mustn't enter a box junction unless your exit is clear. However, you may enter the box and wait if you want to turn right and are only prevented from doing so by oncoming traffic.

Road humps are used to slow down traffic. They're found in places where there are often pedestrians, such as • shopping areas • near schools • residential areas. Watch out for people close to the kerb or crossing the road.

Traffic-calming measures make the roads safer for vulnerable road users, such as cyclists, pedestrians and children. These can be designed as chicanes, road humps or other obstacles that encourage drivers and riders to slow down.

Reflective studs are used to help you in poor visibility. Different colours are used so that you’ll know which lane you're in. These are • red on the left-hand edge of the carriageway • white between lanes • amber on the right-hand edge of the carriageway • green between the carriageway and slip roads.

A rumble device consists of raised markings or strips, designed to give drivers an audible, visual and tactile warning. These devices are used in various locations, including in the line separating the hard shoulder and the left-hand lane on the motorway and on the approach to some hazards, to alert drivers to the need to slow down.

If you’re planning to make a journey when it’s foggy, listen to the weather reports. If visibility is very poor, avoid making unnecessary journeys. If you do travel, leave plenty of time – and if someone is waiting for you to arrive, let them know that your journey will take longer than normal. This will also take off any pressure you may feel to rush.

To prevent your headlights from dazzling the driver of the car in front, wait until you’ve passed them before switching to main beam.

Be patient and stay behind the car in front. You shouldn't normally overtake other vehicles in areas subject to traffic calming. If you overtake here, you may easily exceed the speed limit, defeating the purpose of the traffic-calming measures.

These lines may be painted on the road on the approach to a roundabout, a village or a particular hazard. The lines are raised and painted yellow, and their purpose is to make you aware of your speed. Reduce your speed in good time so that you avoid having to brake harshly over the last few metres before reaching the junction.

Take care when using single-track roads. It can be difficult to see around bends, because of hedges or fences, so expect to meet oncoming vehicles. Drive carefully and be ready to pull into or stop opposite a passing place, where you can pass each other safely.

Other drivers or riders may have to change course due to the size or characteristics of their vehicle. Understanding this will help you to anticipate their actions. Motorcyclists and cyclists will be checking the road ahead for uneven or slippery surfaces, especially in wet weather. They may need to move across their lane to avoid surface hazards such as potholes and drain covers.

A ford is a crossing over a stream that’s shallow enough to drive or ride through. After you’ve gone through a ford or deep puddle, your brakes will be wet and they won't work as well as usual. To dry them out, apply a light brake pressure while moving slowly. Don’t travel at normal speeds until you're sure your brakes are working properly again.

You won’t be able to see as far ahead in fog as you can on a clear day. You'll need to reduce your speed so that, if a hazard looms out of the fog, you have the time and space to take avoiding action. Travelling in fog is hazardous. If you can, try to delay your journey until it has cleared.

The engine will need more power to pull the vehicle up the hill. When approaching a steep hill you should select a lower gear to help maintain your speed. You should do this without hesitation, so that you don’t lose too much speed before engaging the lower gear.

The draught caused by other vehicles – particularly those with high sides – could be strong enough to push you out of your lane. Be prepared for a sudden gust of wind as you overtake large vehicles. Keep both hands on the steering wheel to help you keep full control.

If you’re following another road user in fog, stay well back. The driver in front won’t be able to see hazards until they’re close and might need to brake suddenly. Also, the road surface is likely to be wet and could be slippery.

If you have to park your vehicle in foggy conditions, try to find a place to park off the road. If this isn’t possible, park on the road facing in the same direction as the traffic. Leave your parking lights switched on and make sure they're clean.

If the headlights of an oncoming vehicle dazzle you, slow down or, if necessary, stop. Don’t close your eyes or swerve, as you'll increase your chances of having a collision. Don't flash your headlights either, as this could dazzle other drivers and make the situation worse.

Your fog lights must only be used when visibility is reduced to 100 metres (328 feet) or less. You need to be familiar with the layout of your dashboard so you're aware if your fog lights have been switched on in error, or you've forgotten to switch them off.

Switch off your fog lights if the weather improves, but be prepared to use them again if visibility reduces to less than 100 metres (328 feet).

Don’t forget to switch off your fog lights when the weather improves. You could be prosecuted for driving with them on in good visibility. The high intensity of rear fog lights can dazzle drivers behind and make your brake lights difficult to notice.

Rear fog lights shine more brightly than normal rear lights, so that they show up in reduced visibility. When the visibility improves, you must switch them off; this stops them dazzling the driver behind.

Chains can be fitted to your wheels in snowy conditions. They can help you to move off without wheelspin, or to keep moving in deep snow. You'll still need to adjust your driving to suit these conditions.

You should brake and slow down before selecting a lower gear. The gear can then be used to keep the speed low and help you control the vehicle. This is particularly helpful on long downhill stretches, where brake fade can occur if the brakes overheat.

Letting your vehicle roll or coast in neutral reduces your control over steering and braking. This can be dangerous on downhill slopes, where your vehicle could pick up speed very quickly.

Don't travel in icy or snowy weather unless your journey is essential. Drive extremely carefully when roads are or may be icy. Stopping distances can be ten times greater than on dry roads.

If you’re driving on a motorway at night or in poor visibility, you must always use your headlights, even if the road is well lit. Other road users must be able to see you, but you should avoid causing dazzle.

If you’re driving behind other traffic on the motorway at night, use dipped headlights. Main-beam headlights will dazzle the other drivers. Your headlights’ dipped beam should fall short of the vehicle in front.

Having tyres correctly inflated and in good condition will ensure they have maximum grip on the road; how well your tyres grip the road has a significant effect on your car's stopping distance.

When you take your foot off the accelerator, engines have a natural resistance to turn, caused mainly by the cylinder compression. Changing to a lower gear requires the engine to turn faster and so it will have greater resistance than when it's made to turn more slowly. When going downhill, changing to a lower gear will therefore help to keep the vehicle's speed in check.

Only use your fog lights when visibility is seriously reduced. Use dipped headlights in poor conditions because this helps other road users to see you without the risk of causing dazzle.

Rear fog lights make it easier to spot a vehicle ahead in foggy conditions. Avoid the temptation to use other vehicles' lights as a guide, as they may give you a false sense of security.

Consider whether the increased risk is worth it. If the weather conditions are bad and your journey isn’t essential, then don't drive. If you have to drive, make sure you're well prepared in case you get stuck.

If you have to drive in fog, switch your dipped headlights on and keep all your windows clear. You should always be able to pull up within the distance you can see ahead.

You must turn off your fog lights if visibility is more than 100 metres (328 feet). Be prepared for the fact that the fog may be patchy and you may need to turn them on again if the fog returns.

If your rear fog lights are left on when it isn’t foggy, the glare they cause makes it difficult for road users behind to know whether you’re braking or you’ve just forgotten to turn off your rear fog lights. This can be a particular problem on wet roads and on motorways. If you leave your rear fog lights on at night, road users behind you are likely to be dazzled and this could put them at risk.

Holding the clutch down or staying in neutral for too long will cause your vehicle to freewheel. This is known as 'coasting' and it's dangerous because it reduces your control of the vehicle.

Coasting is when you allow the vehicle to freewheel in neutral or with the clutch pedal depressed. When travelling downhill, this will cause the vehicle to gain speed more quickly as you lose the benefits of engine braking; it may even lead to a loss of control. You shouldn't coast, especially when approaching hazards such as junctions or bends and when travelling downhill.

In normal conditions, a ford can be crossed quite safely by driving through it slowly. The water may affect your brakes, so when you're clear of the ford, test them before you resume normal driving.

Try to look and plan well ahead. Plan your approach to hazards and select the correct gear in good time. This will help give you the control you need to deal with anything unexpected that may occur.

You must use dipped headlights when daytime visibility is seriously reduced, generally to 100 metres (328 feet) or less. You may also use front or rear fog lights, but they must be switched off when visibility improves.