When can the authorities order a bus driver to undergo a fitness assessment?

You answered correctly because all three conditions are valid reasons for authorities to require a bus driver to undergo a fitness assessment.

According to German traffic regulations, a fitness assessment ensures that bus drivers are physically and mentally capable of safely operating a vehicle, especially since they carry many passengers. If a driver has seriously violated traffic laws or committed a serious offence, it raises concerns about their ability to drive safely. Additionally, if there are signs that the driver has a high potential for aggression, this could endanger passengers and other road users. Therefore, the authorities can mandate a fitness assessment to evaluate the driver’s suitability and prevent potential risks.

This rule helps maintain road safety by ensuring that professional drivers meet strict standards of behavior and fitness.