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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.
The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
This report by the Federal Highway Administration (FHWA) provides information about the funding of Federal-aid highways. The report details the fiscal process of funding the highways from inception in an authorization act to payment from the Highway Trust Fund. In addition, congressional and Federal agency actions that take place throughout this process are discussed. Related items: Federal Highway Administration (FHWA) publications can be found here: https://bookstore.gpo.gov/agency/federal-highway-administration-fhwa Department of Transportation (DOT) publications can be found here: https://bookstore.gpo.gov/agency/department-transportation-dot