Teacher:Given a travel related situation, and given a specific question about the situation, summarize the question into a title
Teacher: Now, understand the problem? Solve this instance: Since I don't have any priority, I avoid using priority seats* on busses, trains etc. However I see that other people who have no priority are occasionally using those seats. I wonder if there is a general code or etiquette for it.

Should I continue to avoid using priority seats even if they are vacant?

* Some seats may be for disabled people.

Student:
Can I use a priority seat if it is vacant?