Which of the following is a free fare rider with specific requirements?

Firefighters in full uniform are considered free fare riders under specific requirements because they are recognized as individuals who may be responding to emergencies or providing public safety services. This policy is in place to facilitate their rapid response capabilities, reflecting the importance of their role in the community.

The other options do not align with the established criteria for free fare. Teachers typically do not receive free fares unless there are specific agreements in place with the municipality, and while community volunteers may benefit from certain discounts, they often need to meet additional criteria or present documentation beyond just an identification card. Similarly, bus drivers who are not on duty are not included in this specific provision, as their fare status generally does not provide for free rides outside of work duties.