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How many emblems should be displayed on a vehicle when transporting hazardous materials?

  1. One

  2. Two

  3. Three

  4. Four

The correct answer is: Two

The reason why two emblems should be displayed on a vehicle when transporting hazardous materials is because it is a requirement set by the Department of Transportation (DOT) for safety purposes. Having two emblems allows for increased visibility and serves as a warning to other drivers on the road. The other options are incorrect because displaying only one emblem may not offer enough warning and displaying three or four emblems is not necessary and could potentially be confusing.