Traffic And Street Signs GIFs Cliparts
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones. Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony. With traffic volumes increasing since the 1930s, many countries have adopted pictorial signs or otherwise simplified and standardized their signs to overcome language barriers, and enhance traffic safety. Such pictorial signs use symbols (often silhouettes) in place of words and are usually based on international protocols. Such signs were first developed in Europe, and have been adopted by most countries to varying degrees. International conventions Various international conventions have helped to achieve a degree of uniformity in Traffic Signing in various countries. Categories Traffic signs can be grouped into several types. For example, Annexe 1 of the Vienna Convention on Road Signs and Signals (1968), which on 30 June 2004 had 52 signatory countries, defines eight categories of signs:A. Danger warning signsB. Priority signsC. Prohibitory or restrictive signsD. Mandatory signsE. Special regulation signsF. Information, facilities, or service signsG. Direction, position, or indication signsH. Additional panelsIn the United States, Canada, Ireland, Australia, and New Zealand signs are categorized as follows:Regulatory signsWarning signsGuide signsStreet name signsRoute marker signsExpressway signsFreeway signsWelcome signsInformational signsRecreation and cultural interest signsEmergency management (civil defense) signsTemporary traffic control (construction or work zone) signsSchool signsRailroad and light rail signsBicycle signsIn the United States, the categories, placement, and graphic standards for traffic signs and pavement markings are legally defined in the Federal Highway Administration's Manual on Uniform Traffic Control Devices as the standard. A rather informal distinction among the directional signs is the one between advance directional signs, interchange directional signs, and reassurance signs.
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