This is a warning sign to indicate loose chippings ahead. The sign is usually accompanied by an advisory speed limit. Vehicles travelling too fast for the conditions can throw up chippings or stones. Avoid causing damage to paintwork and windscreens by keeping your speed down.

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.

The red studs on your left indicate the edge of the hard shoulder, while the white studs are used between the lanes. Using more than one reference point will help you to be certain of your position.

If you're involved in an incident that causes damage or injury to a person or property, you must stop. You must also give your details to anyone who has reasonable grounds to ask for them. If you don't do this, you must inform the police as soon as possible and in any case within 24 hours.

The road ahead is at risk from falling rocks and you may also come across fallen rocks in the road

The forces acting on a lorry will try to move it in a straight line as it enters a bend. The greater the weight, the greater the force. If you're going too fast, there's a danger that you could lose your load or tip over.

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.

When there's no traffic ahead of you, you should always drive in the left-hand lane.

Pedestrians and cyclists are shown the green light together. The signals are push-button-operated and there's no flashing amber phase.

It's illegal to use a hand-held mobile phone while you're driving, other than to call 999 or 112 in a genuine emergency. Switch it off before you start driving and use the messaging facility. You can pick up messages when you stop for a rest break. If you must make a call, stop in a safe place before using the phone.

Correctly adjusted air deflectors will save fuel. They should be adjusted to guide the airflow over the highest point at the front of the trailer or load and body.

All drivers should play their part to protect the environment against traffic pollution. Make sure the vehicle you drive is properly maintained. Report any defects, such as excessive exhaust smoke, as soon as you can.

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.

Pedestrians use push-button controls to activate the signals. Pelican crossings have no red-and-amber stage before green. Instead, they have a flashing amber light. This means you must give way to pedestrians on the crossing, but you may proceed if the crossing is clear.

The sign prohibits buses and coaches with more than eight passenger seats and so doesn't apply to you.

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.

It's important to stow away all your electrical cables and air lines safely to avoid causing injury to others. Connectors left lying around can be a trip hazard and can be damaged if they're run over by another vehicle.

Theft of loads from commercial vehicles is a serious problem. You should take steps to safeguard your load when leaving the vehicle overnight. Simply parking with the rear doors close to another vehicle or a wall can act as an effective deterrent to thieves.

Some vehicles are fitted with an audible warning device that sounds when the vehicle is being reversed. As these devices make a loud noise, they shouldn't be used between 11.30 pm and 7.00 am in a built-up area. Audible warning devices are an effective safety feature, but they don't take away the need to use effective observation around the vehicle before and while reversing.

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.

If you wish to overtake a vehicle that's throwing up spray, move out earlier than normal. This will help to limit the reduction in vision that the rear spray will cause before you pass.

It's essential to know the height of your vehicle before setting off. This should be clearly marked, usually in the cab, and visible from the driving position. Look out for restrictions that you may not have seen on a map - they may be temporary.

It's a legal requirement that information about a vehicle's height can be seen by the driver from their seat. It's important to know the height of your vehicle so that you can avoid any height restrictions on your route.

If you want to keep a vehicle untaxed and off the public road, you must make a SORN. It's an offence not to do so. When you've made a SORN, you won't have to pay vehicle tax, but you also won't be able to use the vehicle on the road. The SORN remains valid until your vehicle is taxed, sold, scrapped or exported.

Depending on road speed, pressing the accelerator pedal firmly to the floor will activate a switch that allows the gearbox to select a lower gear for improved acceleration.

When a tyre explodes, fragments are thrown over a wide area. This can create a serious hazard for other drivers. You should regularly check your tyres for cuts, damage and pressure. Frequent checks and proper maintenance can help prevent a blow-out.

ISO (International Standards Organization) cargo containers should only be carried on lorries or trailers with the appropriate securing points. These are designed to lock into the container body.

If your vehicle is too long to fit into a passing place, you may need to wait opposite one. This will allow a following or approaching driver to pass. When you use this type of road, you need to plan and look well ahead to avoid meeting another road user at an inappropriate place.