What do zipper markings indicate in relation to service roads?

Answer: B — Boundaries of a service road

Zipper markings are a specific type of roadway marking that is used to indicate the boundaries of a service road. These markings usually resemble a series of dashed or zigzag lines that serve to delineate the edges of a designated area intended for service vehicles. This visual delineation helps in guiding traffic, ensuring that vehicles remain within the designated paths, and maintaining safety by clearly marking where the service road ends and where other types of roadway or areas may begin. Understanding the role of zipper markings is essential for safe navigation within airport environments, where service roads often have unique requirements and regulations to manage the flow of vehicle traffic effectively. Knowing the boundaries helps prevent unauthorized access and ensures that service operations occur smoothly without disrupting the primary roadways and passenger areas.