Highway shield
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A highway shield is a sign used for denoting the route number of a highway. Used extensively in the United States and around the world, highway shields usually come in the form of a symbolic shape with the route number enclosed. Since the route number should be the most visible element of the sign, it is usually large, while the other items on the sign are smaller or in contrasting colours. Highway shields are used both by travellers, commuters, and all levels of government for identifiying, navigating, and organising routes within a county, state, province, or country.