
This lesson addresses the causes and prevention of trailer sway and jack-knifing, two critical loss-of-control events. It explains how factors like improper braking, high speeds, crosswinds, and poor load distribution can trigger these dangerous situations. Learners will study avoidance strategies, including proper speed management and smooth steering inputs, as well as corrective actions to regain control if sway begins.

This comprehensive course provides essential knowledge for aspiring professional drivers of heavy goods vehicles in Denmark. It details the legal and practical aspects of operating lorries and combinations, focusing on vehicle mass, load management, and advanced braking systems. Learners will understand the specific rules and road situations relevant to heavy transport, preparing them for the official theoretical examination for a C-category licence.
The Trailer Sway and Jack-Knifing Avoidance lesson explains one of the most important subjects in the Trailers, Semitrailers, Coupling and Combination Behaviour unit of the Danish Heavy Vehicle Theory C curriculum. It focuses on essential exam content that every learner in Denmark needs for the Danish driving theory exam. Through clear explanations, practical examples, and real traffic situations, this lesson helps you understand how the rules work in practice and strengthens your overall exam preparation.
After completing this lesson, you will be able to anticipate potential loss-of-control scenarios before they occur. You will gain a deep understanding of how weight distribution, road surface friction, and driver inputs interact to affect the stability of your heavy goods vehicle. This knowledge is crucial for answering complex situational questions in the Danish theory exam that test your ability to make safe, split-second decisions.
On the road, you will be equipped to adjust your driving style in adverse weather or during high-speed transit to minimize the risk of sway. By mastering these avoidance strategies, you ensure higher safety for yourself, your cargo, and other road users, demonstrating the professional mindset required of a licensed Category C driver.


This lesson is essential for all C-category license candidates who need to operate heavy vehicle combinations. It is particularly helpful for those preparing for the practical-theory exam who want to better understand the physics of articulated vehicle stability.
View all lesson topicsFind answers to common questions about the Trailer Sway and Jack-Knifing Avoidance lesson, including how it connects to the Trailers, Semitrailers, Coupling and Combination Behaviour unit and the full Danish Heavy Vehicle Theory C curriculum. Learn how long the lesson takes, what topics it covers, and how it supports your preparation for the driving theory exam in Denmark.

The Trailer Sway and Jack-Knifing Avoidance lesson is designed to make complex driving theory topics easier to understand. Content is written in a clear and practical way, aligned with exam expectations in Denmark, and supported by examples that reflect real traffic situations. Whether you are reviewing or starting from scratch, this lesson helps you study efficiently and make steady progress inside the Danish Heavy Vehicle Theory C curriculum.
Explore additional units that make up the complete Danish Heavy Vehicle Theory C curriculum. Each unit focuses on important driving theory subjects, helping learners in Denmark build strong exam knowledge and improve understanding of rules, signs, and traffic behaviour.

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4 lessonsUse our powerful search tool to pinpoint specific Danish driving theory topics, road signs, or traffic situations you need to review. Start exploring relevant practice sets now to reinforce your knowledge and build confidence for your upcoming driving licence exam.