You're driving a vehicle with an unladen trailer. What could happen if you change down to a low gear while travelling at speed? You're driving a vehicle with an unladen trailer. What could happen if you change down to a low gear while travelling at speed?

• Possible answers:

   
• A. Your vehicle may suddenly accelerate
• B. The endurance brake will come on
• C. You won't be able to brake
• D. You could lose control of your vehicle