Spilt diesel creates a serious risk to other road users, especially motorcyclists. Take care when refuelling and make sure that all filler caps and tank hatches are properly closed and secure.

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.

Always check carefully for cyclists when emerging from a junction. Bicycles, being much narrower than any other vehicle, can be quite difficult to see.

When turning at a mini-roundabout, it's unlikely that you'll be able to avoid going over the marked area. You should, however, avoid going over the roundabout where possible.

When driving high-sided vehicles, such as double-deck buses, changes in the road camber can affect your vehicle. As the bus leans towards the kerb, there's a risk that shop awnings, trees and street furniture, such as lampposts, could strike the top deck.

You should remain in the left-hand lane unless you're overtaking other vehicles. Don't be inconsiderate and stay in the centre lane or other overtaking lanes when you've finished overtaking.

Under no circumstances should you attempt to move or drive a vehicle with an air leak in the braking system. Report the fault immediately, or arrange to have it repaired. Place a warning sign in the cab, telling other drivers not to drive the vehicle and why.

When air is compressed, moisture condenses and collects in the air tanks. This can find its way along the network of pipes connected to the brakes. In frosty weather, the moisture can freeze in the pipes, blocking them completely. On modern vehicles, the air is dried before it's compressed and the air tanks drain automatically to shed any moisture. On older vehicles, the air tanks need draining manually.

Flashing amber lights are found near schools. They warn you that children are likely to be crossing the road on their way to and from school. Drive slowly until you're clear of the area.

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.

Blind spots can occur when bodywork - such as a door or window pillar - restricts your view. Different types of vehicle have different blind spots.

When passing through immigration control, you should have a list of all your passengers. They must all be accounted for.

When a warning light or device indicating a loss of brake pressure comes on, you must stop safely and get the fault put right immediately. The safety of you, your load, your passengers and all other road users is at risk.

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.

Bus stations are busy places. If people are in a rush, they may not always look properly before getting off a bus. Keep your speed down and look for manoeuvring vehicles or pedestrians stepping into your path.

Other road users can be affected by the spray from large vehicles, severely reducing their vision. Always take care when you need to change lanes: signal in good time and watch your mirrors carefully before pulling out in these conditions.

On smart motorways, the hard shoulder can be used as a running lane when a speed limit is shown above it. However, a red cross above the hard shoulder means that this lane shouldn't be used, except for emergencies and breakdowns.

Where the road surface has been made slippery (for example, by spilt diesel fuel), motorcyclists are particularly vulnerable to skidding.

A long lorry with a heavy load will need more time to pass you than a car. It won't be able to accelerate enough to pass you quickly, especially on an uphill stretch of road. Be considerate to the lorry driver - ease off the accelerator and allow the lorry to pass.

Horse riders often keep to the outside of the roundabout even if they're turning right. Give them room in case they have to cross lanes of traffic.

This is the sign for a tram. These vehicles are powered by electricity and reduce the emissions released into the environment. As they can carry many people, they can help to reduce the number of other vehicles on the road.

If the engine contains too much oil, the moving parts can hit the oil surface, causing a loss of power or even damage to the engine. Excess pressure may damage oil seals, causing oil to leak onto the road, creating a slippery and dangerous road surface.

Just before turning, a check in the offside mirror will help you to see any cyclist or motorcyclist passing on your offside. This check may help to prevent a serious incident from developing.

Closed curtains on large empty vehicles can hold the wind. Strong side wind can blow a semi-trailer off course and, in severe cases, can blow the whole vehicle over onto its side. To reduce the risk of this happening, you should tie the curtains open.

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.

Since 2000, all new buses and coaches must be accessible to people with disabilities. These vehicles must have ramps, priority seating and colour-contrasted handrails and steps.

You must always be aware of the size of your vehicle. Look out for road signs that show a width restriction. There should be an indication of this at the entrance to the road. Don't get into a situation where you have to reverse out of a narrow road because you haven't seen a sign.

If you're following cyclists onto a roundabout, be aware that they might not take the exit you expect. Cyclists approaching in the left-hand lane could be turning right but may not have been able to get into the right-hand lane. Give them plenty of room.

Always have a walk round your vehicle and visually check the wheel nuts whenever you take a break. When a wheel is replaced, it's important to have the wheel nuts rechecked shortly after their initial tightening. Wheel nuts must always be tightened to the torque specified by the manufacturer.