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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.

In reality, most people who opt for throwing up a fake warning sign, ADT sign or Vivint yard sign do it because it's less expensive than buying a real security system. Fake security signs are a popular and cheap determent method, and for that reason, they're not always effective. But its also better than nothing.

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.