School;
of;
Traffic;
and;
Transportation;
Engineering,;
Central;
South;
University,;
Changsha;
410075,;
China;
Planning;
Bureau;
of;
Nanning;
City,;
Nanning;
530004,;
China;
College;
of;
Civil;
Engineering,;
Hunan;
University,;
Changsha;
410082,;
China;