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The Switzerland sub-series consists of two folders of material documenting roundabouts and traffic regulations in Switzerland in the 20th century.

The United Kingdom subseries consists of 5 folders, containing materials primarily from the latter half of the 20th century. This includes journal reports, printouts of webpages, and maps. Of particular interest is Todd's focus on England's "Magic Roundabouts." Included is a large, folded engineering diagram of one such roundabout located near Swindon.