What does signage with flashing red lights indicate on roadways that cross controlled taxiways?

Signage with flashing red lights on roadways that cross controlled taxiways serves a critical safety function by indicating that Low Visibility Operations Procedures (LVOP) are in effect. During these conditions, it is crucial for all vehicles to adhere to specific protocols to maintain the safety and efficiency of airport operations. When the lights are flashing, it signals that ground vehicles, including those operated by individual drivers, must contact Ground Control before proceeding to cross the taxiway. This allows for the coordination of aircraft movements and ensures that no conflicts arise between vehicles and aircraft during periods of low visibility. Understanding this procedure is essential for maintaining safety on the airside of the airport, especially in reducing the risk of accidents.