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Mandatory signs (e.g. "Turn right only") bear a white symbol on a blue disk. Prohibitory signs (e.g. "No left turn") take the form of a black-on-white symbol inside a red-bordered circle, sometimes with the addition of a red slash through the symbol. Mandatory signs
Prohibitory signs (e.g. "No left turn") take the form of a black-on-white symbol inside a red-bordered circle, sometimes with the addition of a red slash through the symbol. Mandatory signs (e.g. "Turn right only") bear a white symbol on a blue disk.
Road signs in South Korea are regulated by the Korean Road Traffic Authority (Korean: 도로교통안전공단). Sign for a bicycle crossing. Signs indicating dangers are triangular with a red border, yellow background and black pictograms. Mandatory instructions are white on a blue background, prohibitions are black on a white background with ...
Overtaking is prohibited either for all vehicles or for certain kinds of vehicles only (e.g. lorries, motorcycles). In the USA, this is usually phrased as "no passing zone" and indicated by a rectangular, black-on-white sign on the right side of the road that says "DO NOT PASS", and/or by a solid yellow line painted on the roadway marking the left limit of traffic (centerline), and sometimes ...
Regulatory signs either give positive instructions, i.e. Mandatory signs, or indicate a prohibition, i.e. Prohibitionary signs. Many regulatory signs are accompanied by supplementary plates that provide interdependent exceptions to the rule, or indicates additional instruction or information to facilitate understanding of the rule implemented.
In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).
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Grayscale images are distinct from one-bit bi-tonal black-and-white images, which, in the context of computer imaging, are images with only two colors: black and white (also called bilevel or binary images). Grayscale images have many shades of gray in between.