A speed sign on the roads is an example of a regulatory sign, which is put up by the authorities. Hence, option A is correct.
What is a regulatory sign?
A regulatory sign is a sign which is put up by the appropriate authorities in order to comply with the regulations provided under the law with respect to the same.
A speed sign is put up on the roadside by the traffic authorities, which is regulated under the traffic laws. Thus, the traffic signs are also an example of a regulatory sign.
Hence, option A holds true regarding the regulatory sign.
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