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Traffic Signals, circa 1910s-1980s
The Traffic Signals subseries describes the evolution of traffic signals and traffic signal regulations in the United States throughout the early 20th century. Included are statistics on relative success of various signals and reports on the safety and efficiency of signaling methods. The subseries contains four folders.
Stop Signs, circa 1930s-1990s
The Stop Sign subseries consists of two folders of articles detailing the implementation and use of stop signs. Included are engineering papers regarding traffic accident statistics and the general efficacy and safety of stop signs versus other types of signals.