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The Kenneth Todd Roundabouts Collection details highway interchange planning and regulations from the 1900s-2000s. The collection relates primarily to the implementation of roundabout (traffic circle) interchanges in the United States, but also includes a substantial collection of international articles and photographs, as well as regulatory information. Additional materials include articles on traffic signals such as stop signs, yield signs, and traffic lights; traffic accident statistics; and engineering documentation such as equations and diagrams.

This collection, containing materials ranging from 1896-2002, constitutes much of Kenneth Todd's work and research on roundabouts and traffic signals, particularly in the latter half of the 20th century. Included are photographs, engineering documents, and articles and reports on the safety, efficacy, and design of traffic circles and other signalling devices. Visual and audiovisual materials include reel-to-reel video and slides. The materials primarily relate to traffic management in the United States, but a significant portion of the collection consists of research on the implementation of roundabouts in the United Kingdom and other parts of Europe.