Final answer:
A Yolobus / Sacramento Regional Transit pass is typically valid for the issuing transit system, and one would need to verify if a reciprocal agreement allows its use on Unitrans by checking directly with the transit agencies.
Step-by-step explanation:
The question pertains to the use of a Yolobus / Sacramento Regional Transit pass and whether it is accepted on the Unitrans public transit system. Unitrans is the bus service managed by the Associated Students of UC Davis and serves the city of Davis, California. If you have a Yolobus / Sacramento Regional Transit pass, historically such passes have been valid only on their respective systems unless there is a specific agreement or reciprocity between the different transit agencies. Therefore, it is best to check directly with Unitrans or the agency that issued your pass for the most accurate and current information regarding the pass's validity across different transit services.