Coleman A. O'Flaherty
Richard J. Salter
Montana. Dept. of Transportation
Bent Thagesen
Unknown Author
National Research Council (U.S.). Highway Research Board. Special Committee on Highway Laws.
Transport Conference (1984 Allemanskraal)
Zukang Zhao
Institute of Traffic Engineers.
Jouko A. Parviainen
William T. Baker
"Han Ying Ying-Han dao lu yu jiao tong gong cheng ci dian" bian xie zu
Transportation Development Centre (Canada)
Khosrow Ovaici
Fred L. Mannering
Nicholas J. Garber