Retroreflective warning sign

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Traffic sign — Most countries post signage, known as traffic signs or road signs, at the side of roads to impart information to road users. Since language differences can create barriers to understanding, international signs using symbols in place of words have … Wikipedia
Stop sign — A stop sign is a traffic sign, usually erected at road junctions, that instructs drivers to stop and then to proceed only if the way ahead is clear.pecificationsStandard stop signs have a specified size of 75 cm (30 in) across opposite flats of… … Wikipedia
School bus — This article is about vehicles specifically designed and manufactured for carrying students to and from school. For information about school transportation in general, see student transport. School Bus Front 3/4 view of a typical North American… … Wikipedia
Police car — Two Peel Regional Police police cars near Mississauga, Canada … Wikipedia

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