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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.
More than 50 percent of U.S. roadways are gravel roads, making them a vital part of our transportation system. One of the drawbacks and biggest complaints about gravel roads is the dust they produce when vehicles drive over them. Residents that live on gravel roads deal with the dust that settles on their homes, yards, and parked cars, potentially reducing their quality of life. Dust can also have adverse effects on air quality and the environment and reduce the safety for drivers due to impaired vision. To control the dust on gravel roads, local agencies apply various dust suppressants on their roadways, mainly calcium chloride and magnesium chloride. However, many other dust suppressant options exist. The Minnesota LRRB has developed this document, Dust Control of Aggregate Roads, A Brief Synthesis of Current Practices, to provide local agencies with a summary of research that has been completed on various dust suppressants, their effectiveness, and impacts. Results from two surveys that document dust suppressants that local agencies (within Minnesota and Iowa) use is included as well.
The Code of Federal Regulations is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.