PCV Free Theory Test

Most large vehicles have a rev counter (tachometer) that's divided into coloured bands. This helps you to drive in the most fuel-efficient way and avoid damage to the engine. The green band is the one that gives adequate torque and power with optimum fuel economy.

In England and Wales, vehicles exceeding 7.5 tonnes maximum authorised mass are restricted to a maximum of 50 mph on single carriageway roads. In Scotland, this speed limit is 40 mph.

It's important to keep a safe distance from the vehicle in front at all times. This still applies in congested tunnels, even if you're moving very slowly or have stopped. If the vehicle in front breaks down, you may need room to manoeuvre past it.

Every year, many people are seriously injured by falling from vehicles. Using suitable steps will lessen the chance of falling. Be aware of the dangers when loading or unloading vehicles.

Bulbs should be replaced as soon as you're aware that they've failed. Carry a stock of all the various bulbs used on your vehicle, so you can repair a fault without delay.

Drivers passing incidents often end up having collisions themselves when they're distracted by the scene. You need to keep your concentration in a situation like this and ignore what's happening on the other carriageway.

Leaking fuel can make the road extremely slippery. Look out for this, particularly on roundabouts.

You should check your tyres as part of your routine check of the vehicle. A damaged tyre - such as one with exposed ply - can have a major effect on your vehicle's handling and will make it a danger to you and other road users.

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.

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.

Cyclists and motorcyclists may become unbalanced by your vehicle passing too close. Plan ahead and give them plenty of room. Remember that your large vehicle can cause a vacuum, which will suck the rider towards it. The noise and close proximity of your vehicle can also startle them, and could cause them to swerve suddenly.

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

As the lubricating oil is pumped around the engine, it collects tiny fragments of metal from the moving parts. The oil filter is designed to remove these fragments. Most filters are designed to be replaced at service intervals.

On multi-axled vehicles, the inside wheels on the rear twin-axle are the most difficult to check for punctures and damage. A deflated tyre will transfer the weight to the second tyre of the twin-axle pair. This will overload it and could cause it to burst.

All spare sheets and ropes carried on the vehicle must be tied down securely to prevent them falling onto the road, where they may be a hazard for other vehicles.

To make sure it's safe, you must use the mirrors well before you make any manoeuvre. For example, you need to use them before moving off, turning, overtaking, slowing or stopping, opening a door, or changing direction, lanes or speed.

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.