LGV - Free Test #4

Vehicles carrying loads between 4.3 metres (14 feet 1 inch) and 5 metres (16 feet 6 inches) wide are subject to lower speed limits. The limit depends on the type of road. On a motorway it's 40 mph (64 km/h), on a dual carriageway it's 35 mph (56 km/h), and on all other roads it's 30 mph (48 km/h).

Sulphur produces acidic gases. Diesel fuels with lower sulphur content have been produced to reduce exhaust emissions that harm both people and the environment.

Tyres can become very hot during sustained high-speed driving. If they're under-inflated or damaged, there's a risk they'll burst or disintegrate. Check for excessive heat when you stop for a break.

If you're involved in an incident in a tunnel, be aware of the danger this can cause to other traffic. You should immediately switch on your hazard warning lights and switch off your engine.

Always be concerned for the safety of other road users. Be aware of the various factors and situations where you may have to take action to keep more vulnerable road users safe.

If you're travelling on a motorway and your view ahead is poor, then you should reduce your speed. Leave at least four seconds between your vehicle and the one in front, and make sure that others can see you by using your dipped headlights.

If convicted, the current fine for each illegal immigrant brought into the UK is £2000. This fine can be imposed on each responsible person; this includes the vehicle driver, owner and hirer.

Cycling in today's heavy traffic can be hazardous. Some cyclists might not feel happy about crossing the path of traffic to take up a position in an outside lane. Be aware of this and understand that, although they're in the left-hand lane, the cyclist might be turning right.

The effect of your vehicle driving through a puddle will be to throw water onto the pavement. If there are pedestrians close by, they could be splashed with the water. Be considerate and, if it's safe to do so, avoid driving through the puddle.

Most diesel engines use a high-pressure fuel-injector system that will deliver pressurised fuel directly into the combustion chamber of the engine. This system is known as a direct-injection engine.

A tyre may burst or shred if it overheats. This could result in serious loss of control. Stop on the hard shoulder as soon as it's safe to do so and call for help.

Make allowances for cyclists. Allow them plenty of room, and be aware that they also have to deal with hazards. They might swerve or change direction suddenly to avoid uneven road surfaces.

When connecting a three-line tractor unit to a two-line trailer, the blue line is the one that shouldn't be connected to the trailer. This is the auxiliary line. Always follow the manufacturer's advice: it may be necessary to reconnect the extra line to the tractor unit.

When using ropes, the ends should be spliced or otherwise treated to prevent fraying. The rope should be of at least three-strand construction, with a normal diameter of at least 10 mm.

Vehicles being carried piggyback must always have chocks applied to their wheels, in addition to a restraint. Never rely on just their parking brake.

Wind deflectors reduce a vehicle's wind resistance and so help reduce fuel consumption.

If you become aware that any part of your load is insecure, you must stop as soon as it's safe to do so. Resecure the load before continuing your journey. If this isn't possible, then you must seek assistance. Don't take risks.

The reverse warning bleeper is fitted to your vehicle to warn others near the vehicle that it's reversing. However, it's no substitute for good all-round observation. Get someone to guide you if you can't see clearly where you're reversing.

Where a motorway has a steep uphill gradient, slow-moving, large vehicles might get in the way of other traffic. An extra lane on the left may be provided for these slow-moving vehicles. It allows faster-moving traffic to flow more easily.

When you're being overtaken, the other driver has to decide when it's safe to complete the manoeuvre. Don't give an unofficial signal, however well intended. There may be a hazard you're unable to see from your position.

Every year, there are hundreds of incidents in the UK where vehicles hit railway or motorway bridges. Most involve buses, coaches and lorries. Make sure your route doesn't take you under a bridge that's too low for your vehicle. If you hit a bridge, you'll be putting yourself and any passengers at risk, and you could cause a major disruption to road and rail transport.

Continuous use of the brakes on a long downhill gradient can cause them to overheat and become ineffective. This is called brake fade. You should use a low gear to enable the engine's braking effect to help control your speed. Also use the vehicle's retarder, if fitted. As well as reducing the likelihood of brake fade, this helps to keep air pressure in the tanks.

Plan your journey and take breaks to keep in touch if necessary. When driving on motorways, you can't just stop to use your mobile phone. You'll need to turn off the motorway or wait until you reach the next service area. Avoid being distracted by switching your phone off while you're driving; use the message facility to listen to any calls when you've parked safely.

Roll-over' usually happens as a result of the inside rear wheels of an articulated vehicle starting to lift when the driver changes direction sharply. This tends to happen when a driver is changing direction to leave a roundabout. If the load moves during the change of direction, the vehicle is increasingly at risk of rolling over. The problem often involves vehicles carrying fluids in bulk.

If your suspension is damaged, all the weight of the vehicle compresses the road and anything located below it. The vibrations travel through the ground and can also damage surrounding buildings.

Operators must set up an 'effective system' to prevent the carriage of illegal immigrants. This should include documentation with advice on vehicle security and a list of checks to be made. These papers should be produced immediately if an immigration officer asks to see them.

Lanes at roadworks often have weight restrictions to keep larger vehicles in the left-hand lane. The lanes through the roadworks are often narrow and therefore not wide enough for large vehicles to pass each other safely. Always look for restriction signs at roadworks. They're usually placed well in advance to give you time to move safely into the correct lane in good time.

Don't continue to drive if you feel the onset of tiredness. Find a safe place to stop for a rest. Walking around in the fresh air during your break will help but it's no substitute for adequate rest.

High-value cargoes are often targeted by thieves. Operators are recommended to seek advice from their local crime-prevention officer to help prevent their vehicles and loads from being stolen.