What does a continuously flashing yellow light indicate?

[RachelRose]

A continuously flashing yellow light indicates that vehicles that have already crossed the stop line may proceed, while vehicles that have not crossed the stop line must stop and wait. Motor vehicles are not allowed to accelerate through. Meaning of traffic signals: Traffic signals are lights that direct traffic flow, generally consisting of red, green, and yellow lights. A red light indicates prohibition of passage, a green light indicates permission to proceed, and a yellow light serves as a warning. Classification of traffic signals: Motor vehicle signal lights, non-motor vehicle signal lights, pedestrian crossing signal lights, directional indicator lights (arrow signal lights), lane signal lights, flashing warning signal lights, and road-railway level crossing signal lights.