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This page has specialist questions for heavy vehicle drivers regarding Class 3 and 5 heavy vehicle dimensions.

You can use these questions to test yourself, or have a friend or family member test you.
If you don’t know the answer, click on the link underneath the question to find out.


1 What is the maximum width permitted for a heavy trailer (other than an agricultural trailer) from its longitudinal centre line? _____ metres

Dimension requirements - width


2 What is the maximum distance a load may extend behind the body of a trailer before an overdimensional flag is required? _____ metres

Projecting loads


3 What is the forward distance of a full trailer (other than a pole trailer), the front axle of which is steered by a towbar?

Heavy combination motor vehicles types - axles


4 Between which points is the forward distance of a semi-trailer measured? From the _____ to the _____

Heavy combination motor vehicle types - forward distance


5 What is the maximum distance a load may extend out from the side of the body of a trailer before an overdimensional flag is required? _____ mm

 Projecting loads


6 What is the maximum permitted forward distance of a semi-trailer? _____ metres

 Heavy combination motor vehicle types - forward distance


7 For a heavy full trailer, the maximum rear overhang including its load is the lesser of: _____ metres or _____

Heavy combination motor vehicle types - rear overhang


8 What is the maximum overall length for a truck and semi-trailer combination including its load? _____ metres

Heavy combination motor vehicle types - overall length


9 What is the maximum overall length for any heavy motor vehicle towing two trailers and including their load? _____ metres

Towing two trailers


10 What class of licence is required to drive a combination vehicle that has a gross combined weight of 25,500kg? Class _____

Classes of driver licence - heavy combination vehicles


11 What is the lowest class of licence required to drive a combination vehicle that has a gross combined weight of 14,000kg? Class _____

Classes of driver licence - medium combination vehicles


12 What is the maximum height of a heavy motor vehicle from the ground?

Dimension requirements


13 What is the maximum forward distance for a heavy motor vehicle with a tow coupling? _____ metres

Dimension requirements


14 During the hours of darkness, when the load you are carrying is greater than 1 metre wide and extends from the rear of the vehicle by more than 1 metre, what warning devices are required?

Projecting loads