Vehicle Weights and Dimensions

Plated weights, axle loads, length and height limits, abnormal loads.

What this topic covers

Plated weights, axle loads, length and height limits, abnormal loads. The full LGV Theory Test app contains 64 questions on this topic, drawn from the official DVSA bank.

Worked examples

Here are a few practice questions from this topic. Try answering each before reading the explanation.

Example 1

This sign means no entry for goods vehicles

A. under 7.5 tonnes maximum authorised mass
B. over 7.5 tonnes maximum authorised mass ✓ correct
C. over 7.5 metres overall height
D. under 7.5 metres overall height

Explanation: It’s essential that all limits are complied with to avoid breaking the law and facing possible prosecution. Weight restrictions normally apply to the plated weight of a vehicle, often referred to as the maximum authorised mass (MAM).

Example 2

You are the driver of an articulated car transporter. When turning corners, you should be aware that the overhang of the top deck swings through a

A. smaller arc than the cab
B. shorter arc than the cab
C. lower arc than the cab
D. greater arc than the cab ✓ correct

Explanation: The longer top deck needs a wider turning circle than the cab below it. To avoid hitting lamp posts or telegraph poles etc., you must be careful to allow for this overhang when turning.

Example 3

Triangular projection markers are required when your load is wider than 2.9 metres (9 feet 5 inches). What colour are these? (9 feet 5 inches). What colour are these?

A. Black/yellow
B. Red/yellow
C. Black/white
D. Red/white ✓ correct

Explanation: The marker boards should be red and white. To ensure that they can be seen clearly by other road users they must be kept clean and independently lit at night and in poor visibility.

Example 4

Bells hanging across the road warn of

A. a weight restriction
B. trams crossing ahead
C. overhead electric cables ✓ correct
D. a railway level crossing

Explanation: If your vehicle exceeds the safe travelling height beneath electrified overhead cables, bells suspended over the road will give you an audible warning. If your vehicle disturbs the bells you must stop immediately and seek advice.

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