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TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
A fascinating look at the rise and growing popularity of the automobile during the first half of twentieth-century America, which brought with it a dark undercurrent. On the one hand, Americans embraced the newfound sense of freedom and mobility embodied by the automobile; on the other, they grew increasingly anxious about and fearful of the enormous threat that cars--and car accidents--posed to public safety.