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Traffic congestion is a condition on transport networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased vehicular queueing. The most common example is the physical use of roads by vehicles.

The 4 types of safety signs are:Fire safety signsEmergency exit signsRoad traffic regulations within the workplaceProhibition signageThese 4 important safety signs can be broken into categories: Prohibition, Warning, Mandatory and Emergency.

Traffic signs are divided into three basic categories: regulatory, warning, and guide signs. The shape of a traffic sign communicates important information about the sign's message. In poor visibility conditions, such as heavy fog, you may be able to make out only the shape of a sign.