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According to the rules for signs in Spain the posted image indicates an end for track reserved for cars. Which was not an answer available on this 'test'. The image for 'End of Expressway' is an image of an Autovia in a blue rectangle with a red slash diagonally across the Expressway.
I would say that a track reserved for cars is the same as an expressway, and an autovia is more like a motorway/highway.