Which vehicles are allowed to use depressed roadways?

The correct choice highlights that only tugs, tractors, and emergency equipment are permitted to use the depressed roadways. This distinction is essential because depressed roadways are designed for specific operational needs at the airport, primarily to facilitate the movement of heavy duty and emergency vehicles that have a legitimate operational requirement to navigate these routes.

Tugs and tractors are typically used for baggage and cargo handling, while emergency vehicles must have immediate access to various areas of the airport for quick incident response. Allowing only these specific types of vehicles helps regulate traffic and ensures safety in areas that may be more confined or have unique operational considerations.

Conversely, other types of vehicles, such as passenger buses, taxis, and maintenance vehicles, do not have a defined operational need for using these specific roadways. They are generally routed on other pathways that are more suitable for their regular operations without risk to airport efficiency or safety protocols. This segregation of vehicle types maintains order and efficiency within the airport’s infrastructure.