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Of all the signs in the world, the stop sign is probably one of the best known. Originally invented in Michigan in 1915 as a way to prevent collisions at intersections, traffic lights quickly gained popularity and will probably be published shortly in intersections around the country. Originally a 24-inch square white with black letters, the character has changed over the last 90 years to reach its present iconic. You can see signs boards outside the office, schools or institutes and law enforcement has made it mandatory to follow these signs. School stop signs shows that drive slowly or be cautious, children school is ahead.

The first change in the appearance of stop signs came shortly after its foundation. The American Association of State Highway Officials in 1922, standardize the character and chose the octagon as a new form. Using any other character in the United States had not yet been made in this direction, so that the committee was satisfied that the sign is very recognizable by its unusual shape. He also said that a driver also from the opposite direction, find the characters and to recognize that oncoming traffic would stop.

The next change was made to sign to stop with color. It was a rival organization, the National Conference on Street and Highway Safety, which advocates a small red yellow signal simultaneously. The two groups eventually merged to joint control the standard traffic signs. It is the first organization that is designed to stop sign, black letters on a yellow background. We believe that because the red stop sign used to say "STOP" to stop must match. Following school stop signs or any other can prevent many accidents. Law enforcement is working in organized way to make people aware about these sign boards and what they represent.