Mark one answer
The brakes could fail
The vehicle could jack-knife
The engine could stall
The trailer could uncouple
Explanation: Severe braking or selecting a gear too low for your road speed can cause the tractor unit to slow more quickly than the trailer. The trailer can then pivot around the coupling (fifth wheel), causing the vehicle to jack-knife. Jack-knifing is more likely to occur with an unladen vehicle, particularly on a bend or curve.
Category: Braking Systems
References: The Official DVSA Guide to Driving Goods Vehicles: Section 2
- 1
Sign Up Quickly & Easily 📝
Register with your email and set a secure password in just minutes. Gain full access to all the practice materials. - 2
Complete Your Payment 💳
Make a secure one-time payment to unlock unlimited access to training material, mock tests, AI-powered questions and hazard perception videos. - 3
Start Practicing 🚀
Log in and begin! Take unlimited practice tests, get instant feedback, and master every aspect of your theory test.
easy pricing
Premium Membership
£11.99 /one-off payment
- Complete training course included
- 700+ AI-powered theory test questions
- Official DVSA answers & explanations
- Unlimited mock tests
- 250+ CGI & real-life hazard perception clips
- Progress tracking, mobile-friendly & always up-to-date