The car is the most stable of the vehicles shown. However, all vehicles are affected by side wind and buffeting from larger vehicles. Be aware that your speed and road position could cause unnecessary turbulence when passing smaller vehicles.

The parking brake must always be set whenever you leave the vehicle. It's an offence not to leave your vehicle properly secured.

As you turn a corner, the hanging meat carcasses will all swing to one side of your vehicle, adding extra pulling force towards the outside of the curve. The faster you turn a corner, the greater this force will be. After the corner, the carcasses will continue to swing back and forth, like pendulums, making the vehicle unstable.

It's illegal to drive a vehicle that's emitting excessive exhaust smoke, so you should get the problem fixed as soon as you're aware of it. Excessive exhaust smoke increases pollution and creates a hazard for other road users.

Jack-knifing occurs when the tractor unit is pushed by the semi-trailer pivoting around the coupling (fifth wheel). This is more likely to occur with an unladen vehicle.

Switch your engine off when you're stationary for some time, especially where noise and exhaust fumes may cause annoyance. This can help to protect the environment and save fuel.

Rope hooks aren't designed to withstand high forces. They're usually just welded or bolted to the underside of the platform. Many are so weak that they can easily be distorted by a ratchet buckle when a webbing strap is tightened. Secure anchorage points should be built into the main frame or chassis of the vehicle.

Avoiding busy times means that you're not adding needlessly to traffic congestion. Other advantages are that you'll use less fuel and you may have an easier journey, making you feel less stressed.

Be careful of giving lifts to strangers; some employers actively discourage it. Allowing strangers in your cab or telling people about your load could put the security of your vehicle and load at risk, and may put you in danger.

Although they're advised to wear clothing that's bright or reflective, motorcyclists often wear clothing that's mainly black. This can make them difficult to see, so you must look carefully for them.

If you're disqualified from driving because you were two-and-a-half times over the legal limit, you'll be classified as a high-risk offender. Before you can regain your licence, you'll have to satisfy the Driver and Vehicle Licensing Agency (DVLA) that you don't have an alcohol problem.

In queuing traffic, motorcyclists may take the opportunity to filter between the lanes. Be aware that they may pass on either side and very close. Stay alert and always check your mirrors and blind spots before moving off, changing lanes or turning.

You should take account of the weather forecast when you plan your route. You're most likely to be subjected to side wind on exposed routes; for example, on long bridges, open roads and exposed stretches of motorway.

Just like your bus tyres, your trailer tyres must be in good condition. You might not tow a trailer on every journey you make, but when you do, check the trailer tyres while they're cold and make sure they're suitable for the load they'll carry.

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

Some exposed places are frequently subject to high winds. These include high-level bridges and roads, viaducts and some motorways. Check the weather forecast and plan an alternative route. Remember, you're responsible for your passengers' safety. Don't ignore warnings of severe winds.

Always get expert advice when dealing with tyres. It's good practice to have a new valve fitted when replacing a tubeless tyre. Good garages and specialist tyre services know the regulations.

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.

Always have wheel nuts checked soon after their initial tightening. They should be tightened to the torque specified by the vehicle manufacturer.

Power-assisted steering operates when the engine is running. If a fault develops, much greater effort is required to turn the steering wheel. Don't attempt to drive a vehicle if you're aware of a fault in the power-steering system.

Warning buzzers are linked to many systems on modern vehicles, including the air brakes. A warning light on the dashboard may help you identify the system that's caused the problem. Stop in a safe place until the fault has been identified and put right. Get professional help if necessary.

A red cross above the hard shoulder means that it's closed as a running lane and should only be used for emergencies or breakdowns. At busy times, the hard shoulder may be used as a running lane; the red cross will then be replaced by a mandatory speed-limit sign.

Using the brakes to control a lorry's speed as it's driven down a hill will cause them to get hot. If they overheat, they can become less effective - a condition known as brake fade. By selecting a low gear, the engine's resistance will slow the lorry. This reduces the demands on the brakes, making them less likely to overheat.

Poor planning leads to late braking and harsh acceleration. This causes higher fuel consumption and increased emissions, which is harmful to the environment.

If you overfill the engine with oil, you could cause the engine to build up too much pressure when it's running. This could cause damage to oil seals and gaskets.

Give way to buses whenever you can do so safely, especially when they signal to pull away from bus stops. Look out for people who have left the bus and wish to cross the road. Also look for people rushing to catch a bus: they may be more concerned about catching the bus than watching for traffic.

Vehicles that carry dangerous goods have badges displayed on the side and rear. The badges are orange and show the type of material that's being carried. Make a note of this and report it to the emergency services when you contact them.

Learning is a process of practice and experience. Try to understand this and tolerate others who are at the beginning of this process.

The priority when dealing with an unconscious person is to make sure they have a clear airway and can breathe. Stay with the casualty and make sure someone rings for an ambulance.