Could it be prohibited to drive a vehicle when you are tired?
“A vehicle may not be driven by a person who, due to illness, fatigue, intoxication by alcohol, other stimulants or sedatives, or for other reasons is incapable of driving the vehicle in a safe manner.” (Road Traffic Ordinance)
You are permitted to be tired as long as you are able to drive the vehicle safely. For this reason, the question is whether it “could” be prohibited, not whether it is always prohibited (which is not the case).
There is also a driving licence book online (2022).
More examples of theory questions: