Ambers lights are used to indicate what?

Answer: C — Service roads

Amber lights are specifically used to indicate service roads. These lights provide visual cues to drivers within the airport environment, signaling the presence of service road areas that are not intended for aircraft movement but may be used for ground services and maintenance vehicles. This color coding is crucial in maintaining safety and efficiency at the airport, as it helps drivers navigate through different zones designed for various purposes. Clear distinctions between operational zones, such as runways, taxiways, and service roads, are essential for reducing the risk of conflicts between vehicles and aircraft. Service roads are typically positioned around the airport to support necessary ground operations and infrastructure, making the amber lights pertinent in this context.