Which type of light identifies the command, "Stop! Do not proceed"?

The identification of specific commands using lights is crucial for safety in airport operations. A steady red light signals "Stop! Do not proceed," indicating that all activities must cease immediately. This command is essential for preventing accidents or dangerous situations, particularly in areas where aircraft and vehicles operate in close proximity.

In contrast, a flashing red light often indicates a warning or danger but may not carry the same immediate stop command as a steady red light. Flashing green typically signifies that it's safe to proceed, or it may indicate health or safety checks in place, which invites action rather than halting it. Alternating green/red flashing lights can combine commands or alerts, typically signaling pilots or vehicle operators about differing conditions but not specifically denoting an outright stop.

Understanding the implications of these signals is vital for airport safety, ensuring all personnel respond appropriately to the commands given by light signals.