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Variable message signs can be placed:

AOn the right side of the carriageway.
BOnly above the road.Correct
COn the right side or above the carriageway.
Explanation
Variable message panels are intended to transmit real-time information to drivers about traffic, safety, or weather conditions. This type of signage is designed to be installed on suspended structures, such as gantries, being positioned solely above the traffic lane to ensure quick and effective reading by those traveling on it.The remaining options are incorrect because lateral placement, specifically on the right side of the carriageway, is not the regulatory location for these variable message panels, which must always be suspended above the traffic lanes for which the information is directed.
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