The Expert will be specific knowledgeable people at the Department of Transport, Arrive Alive Communications, the Road Traffic Management Corporation or others who might have the expertise to answer the question.
The only difference between a yellow sign and its non-yellow equivalent permanent version is that the yellow version takes precedence over the permanent version.
The question cannot be answered with a straight Yes of No because it is not clear from the e-maiol what shape the sign is. Suffice it to say that if the sign is a round regulatory speed limit sign with a red border, then it means you may not exceed the speed shown on the yellow sign, and the speed limit is enforceable by law.
If it is a yellow rectangular sign that is below a yellow triangular warning road sign, then it is there to indicate the recommended speed related to the road situation ahead as depicted on the accompanying warning sign.
I hope this helps.
