TRB's National Cooperative Highway Research Program (NCHRP) Report 559: Communicating Changes in Horizontal Alignment explores three recommended modifications to the Manual of Uniform Traffic Control Devices related to communicating changes in horizontal alignment for two-lane, two-way rural roads.
National Research Council. NCHRP Report 559: Communicating Changes in Horizontal Alignment. Washington, DC: The National Academies Press, 2006.
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