National Academies Press: OpenBook

Converting Paved Roads to Unpaved (2015)

Chapter: Glossary

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Page 26
Suggested Citation:"Glossary ." National Academies of Sciences, Engineering, and Medicine. 2015. Converting Paved Roads to Unpaved. Washington, DC: The National Academies Press. doi: 10.17226/21935.
Page 26

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27 NEPA—National Environmental Policy Act NPS—National Park Service PASER—Pavement Surface Evaluation and Rating PC—portland cement PCC—portland cement concrete PCI—pavement condition index RAP—recycled asphalt pavement RCI—Roadway Condition Index RMP—Road Management Program or Road Maintenance Priority RROMAC—Rural Roads Operations and Maintenance Advi- sory Committee SRS—secure rural schools TERRA—Transportation Engineering and Road Research Alliance TxDOT—Texas Department of Transportation URi—Unpaved Road Institute USFS—U.S. Forest Service USF&W—U.S. Fish and Wildlife Service VPD—vehicles per day VTrans—Vermont Agency of Transportation AADT—average annual daily traffic ADT—average daily traffic AST—asphalt surface treatment BLM—Bureau of Land Management BOMAG—brand name road recycler/reclaimer BST—bitumen surface treatment CaCl2—calcium chloride Caltrans—California Department of Transportation CSAH—County State Aid Highway DOD—Department of Defense DOT—Department of Transportation FDR—full-depth reclamation GIS—Geographic Information System HCADT—heavy commercial average daily traffic IRI—International Roughness Index LRRB—Local Roads Research Board LTAP—Local Technical Assistance Program LVR—low-volume road MCEA—Minnesota County Engineers Association MgCl2—magnesium chloride MnDOT—Minnesota Department of Transportation NACE—National Association of County Engineers GLOSSARY

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TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 485: Converting Paved Roads to Unpaved explores how common and under what conditions paved roads are converted to unpaved.

NCHRP Synthesis 485 found that the practice of converting paved roads to unpaved is relatively widespread; recent road conversion projects were identified in 27 states. These are primarily rural, low-volume roads that were paved when asphalt and construction prices were low. Those asphalt roads have now aged well beyond their design service life, are rapidly deteriorating, and are both difficult and expensive to maintain. Instead, many local road agencies are converting these deteriorated paved roads to unpaved as a more sustainable solution.

According to the report, local road agencies have experienced positive outcomes by converting roads. Many local road agencies reported cost savings after converting, compared with the costs of continuing maintenance of the deteriorating paved road, or repaving. One key to successful conversion is early involvement of the public in the planning process. Other techniques that can be used to improve the overall results of a project include treating or stabilizing granular surfaces to control dust, limiting the rate of aggregate loss, and reducing motor grader/blade maintenance frequency. Stabilization procedures can also improve safety, increase public acceptance, and reduce life-cycle costs and environmental impacts after a conversion has taken place.

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