I think it is an interesting question. I explain my opinion about that. Instead of being about one kind of information, as their name its called variable it is not possible to determine in all cases what exact information you will have from them. But you can map about the types because of the kind of panel you are mapping. In the PDF file above you can see a lot of variable signs with one kind of information only.
Here in Spain variable information big panels are ES:S800 / S810 as you can see in https://www.boe.es/legislacion/codigos/abrir_pdf. php?fich=020_Codigo_de_Trafico_y_Seguridad_Vial.pdf (Spanish traffic law). As the Spanish government (Ministerio de Fomento) give us an inventory with all the traffic signs in their roads Spanish government handle this as a "normal trafic sign" with the only observation it is electrical or variable. For panels with variable speed I would use traffic:sign:forward=ES:R301 maxspeed:forward=variable side=right As you cannot define the exact information you will get through the panel I think you can use the https://wiki.openstreetmap.org/wiki/Proposed_features/ Extended_traffic_signs_tagging to describe the panel itself and considers it a traffic sign. For big panels with unspecific target of the information: traffic_sign:forward=ES:S800 side=up Other info you want I hope it will be useful this approach. Salut i senyals de transit variable (Health and variable traffic signs) yopaseopor
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