Levinson, H S, Harwood, D W, Gluck, J S, Garvey, P M, Torbic, D J, Richard, K R, Potts, I B, Ghebrial, R S, Transportation Research Board "
Appendix B - Summary of Survey Responses From State and Local Highway Agencies ."
NCHRP Report 524: Safety of U-Turns at Unsignalized Median Openings . Washington, DC: The National Academies Press,
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