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Question:

This sign is used

A to prohibit vehicles from entering a roadway.
Explaination

This is a Do Not Enter sign. It indicates that you are not allowed to enter the roadway at which the sign is posted. You will see such signs at roadway openings that you are not to enter or where you would be driving the wrong way on a one-way roadway. You will see these signs at exit ramps, in crossovers on divided roadways, and at numerous locations on one-way roads.