Correct answer
The lower it is, the less drag under those same conditions.
A lower value: under those equal conditions, lower Cx produces less drag and reduces the energy needed to overcome it. The coefficient is not itself the drag force. It also does not guarantee greater stability or less deviation in crosswinds; those properties depend on other factors and aerodynamic forces. Drag, lift and side forces are distinct.
Practice more C licence questions
A self-check with exam-style questions on Truck driving techniques. Free, no signup.
All options
The higher it is, the less drag under those same conditions.
It has no effect on drag when the other conditions remain equal.
The lower it is, the less drag under those same conditions.
Editorial status: editorially approved. This status does not certify legal review. Report a correction
Keep studying
Related questions
- Why should a high-visibility vest be stored away from prolonged sunlight, following its instructions?
- When must drivers of heavy vehicles indicate that they can be overtaken?
- A category N2 or N3 lorry uses rear-view mirrors and has no approved alternative indirect-vision system. May it drive without the mandatory left main exterior mirror, replacing it with an interior mirror?
- Which of these behaviours may increase a young driver’s crash risk when carrying passengers?
- Near pedestrians or cyclists, with a C1 or C truck, you must:
- An 11-metre lorry follows another vehicle without intending to overtake. In which of these situations is the additional minimum 50-metre gap required?