A flashing sign is a sign that contains a sequential flashing light source where the period of time of illumination is equal to the period of non-illumination, and is used solely to attract attention in a non-informative way.
The light can be intermittent or flashing, scintillating, blinking or traveling which give an illusion of flashing or intermittence or as an animation.1
References
References
- Wyckoff, Mark A. (1989). Sign Regulation: An Overview of the Issues and Alternatives. MSPO.