Heavy Fog Flag

This is to be flown when visibility is low due to dense fog.  The heavy fog alert flag uses the colours black, yellow, and green.  The flag is quartered like a checker with black.  In the center is a circle that is divided into four with semi-counter charge of black to green, but instead of green to black the colour yellow is used as a signal indicator.

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Photo Credit: http://www.geo.tv/article-130666-Muzaffargarh-Jahanian-fog-related-traffic-mishaps-4-killed