What can lead to a review of your fitness to be a bus driver?

Your selections are correct. To be a bus driver in Germany, your fitness is primarily evaluated based on your physical and mental capabilities. Authorities review your physical health and mental suitability to ensure passenger safety. The reliability of your employer is not relevant for your personal fitness assessment. If issues arise concerning your physical or mental health, these can prompt an official review of your suitability to continue as a bus driver. Remember, regular health checks are a legal requirement for professional drivers.