TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2101 includes 13 papers that explore rural low-volume roads issues, including objective distress measures for evaluating unpaved road condition, estimating roughness of unpaved roads, and assessing heavy traffic impacts on gravel roads. This issue of the TRR also examines the three-point imaging test for the American Association of State Highway and Transportation Officials (AASHTO) soil classification, the effect of exopolymers on the liquid limit of clays, evaluating road substructure drainage systems using structural asset management, the matric suction prediction model in the AASHTO Mechanistic-Empirical Pavement Design Guide, soil suction, subgrade resilient modulus, and double draining layer flexible pavements.
    
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