Which type of sign provides mandatory instructions for vehicles?

Mandatory Instruction Signs are specifically designed to provide clear directives that must be followed by pilots and vehicle operators on the airside. These signs are typically red with white lettering to convey their importance and urgency, making it evident that they indicate actions that are required or prohibited. Examples of instructions might include directives regarding speed limits, stop instructions, or specific compliance with air traffic control directives.

Understanding the role of these signs is critical for ensuring safety and order in the high-stakes environment of an airport. Observing and adhering to mandatory instruction signs is essential for preventing accidents and maintaining smooth operations on the airside.

In contrast, a Runway Location Sign identifies a specific runway location, while a Taxiway Location Sign indicates the position of a vehicle on the taxiway. Controlled Taxiway Signs, meanwhile, warn of taxiways that require specific clearance before entry. While all these signs provide important information, only the Mandatory Instruction Sign serves the critical role of issuing binding instructions that must be followed by all vehicles operating in that area.