Semi-trailer truckSouth Africa

An introduction to the traffic rules and road signs of South Africa. Learn about driving, road safety and much more in our illustrated book, with answers to frequently asked questions.

For informational purposes only. Always follow official regulations. Some content and images were created with AI assistance.


37. Semi-trailer truck

A semi-trailer truck is a combination consisting of a road tractor and a semi-trailer used primarily for transporting goods. The semi-trailer is coupled to the tractor so that a significant part of its weight is supported by the tractor rather than entirely by its own wheels.

Semi-trailer trucks are commonly used for long-distance freight transport and may carry containers, refrigerated goods, liquids, bulk materials or other cargo. Special rules can apply concerning driving licences, maximum dimensions and masses, speed limits, lane use, overtaking, loading and driving and rest periods.

Semi-trailer truck
A Mercedes semi-trailer truck. (Regensburg, Germany)
Wikimedia.org • High Contrast • CC BY
What is a semi-trailer truck?

A semi-trailer truck consists of a powered road tractor coupled to a semi-trailer primarily used to transport goods.

🔗 wegcode.be • Belgium, Technical Requirements Decree of 15 March 1968, Article 1, vehicle/machinery classifications; national example

🔗 wegcode.be • Belgium, Driving Licence Decree of 23 March 1998, Article 2, vehicle categories including G; national example

🔗 wetten.overheid.nl • Vienna Convention on Road Traffic, Articles 1, 13 and 30; international framework subject to national law

🔗 gov.uk • Great Britain Highway Code, Rules 124–126, vehicle-specific speeds; national guidance example

What is the difference between a semi-trailer and an ordinary trailer?

A semi-trailer is designed so that a substantial part of its own weight and load is supported by the towing vehicle. Other trailer designs support the load differently; some also impose a vertical load on the towing vehicle. Check the actual trailer and coupling ratings.

🔗 wegcode.be • Belgium, Technical Requirements Decree of 15 March 1968, Article 1, vehicle/machinery classifications; national example

🔗 wegcode.be • Belgium, Driving Licence Decree of 23 March 1998, Article 2, vehicle categories including G; national example

🔗 wetten.overheid.nl • Vienna Convention on Road Traffic, Articles 1, 13 and 30; international framework subject to national law

🔗 gov.uk • Great Britain Highway Code, Rules 124–126, vehicle-specific speeds; national guidance example

Do semi-trailer trucks have lower speed limits?

They often do. Many countries impose vehicle-specific maximum speeds on heavy goods vehicles, particularly on motorways and other high-speed roads.

🔗 wegcode.be • Belgium, Technical Requirements Decree of 15 March 1968, Article 1, vehicle/machinery classifications; national example

🔗 wegcode.be • Belgium, Driving Licence Decree of 23 March 1998, Article 2, vehicle categories including G; national example

🔗 wetten.overheid.nl • Vienna Convention on Road Traffic, Articles 1, 13 and 30; international framework subject to national law

🔗 gov.uk • Great Britain Highway Code, Rules 124–126, vehicle-specific speeds; national guidance example

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