Final answer:
One should not drive a bus if they are upset, have been drinking alcohol, or are fatigued, as any of these conditions can impair the ability to drive safely.
Step-by-step explanation:
You should not drive a bus if any of these apply: a. You are upset, b. You have been drinking alcohol or c. You are fatigued. Operating a vehicle requires full attention and alertness, and these conditions can significantly impair your ability to drive safely. For instance, if you're always tired, it can be difficult to concentrate on the task at hand or make quick, responsible decisions. Emotional distress, such as feeling like you've lost control of your life or feeling guilty about neglecting other obligations, can also be distracting and dangerous while driving. Furthermore, driving under the influence of alcohol is not only illegal but also greatly increases the risk of accidents.