In transnational history of traffic, transport, and mobility, historians have been arguing for studying organizations as “transnational system builders” in the establishment and modification of transnational infrastructure. Emphasis has been placed on examining human actors. Here, I argue that the role of material objects, the nonhuman actors, should also be taken into account by investigating how a particular map matters. The major research issue is, therefore: How can we understand and analyze how the Nazi regime put the map Deutschlandkarte displayed at the exhibition Die Strasse (Munich, 1934) into play? In addition, how did the map figure in transnational system building during and after the seventh International Road Congress arranged by the Permanent International Association of Road Congresses? Insights from transnational history in the fields of traffic, transport, and mobility as well as material cultural studies, critical mapping, and actor-network theory inform this article.