Lee, D. K., Chae, C. D., Cho, H. S. and Jeong, J. H. (2010). “Estimation of optimal
traffic volume for 2+1 roads based domestic two-lane highway conditions in highway
planning aspects.” 62th Korean Society of Transportation Conference, Korean Society
of Transportation, Seoul, pp. ii-421-426 (in Korean).Lee, D. K., Chae, C. D., Cho,
H. S. and Jeong, J. H. (2010). “Estimation of optimal traffic volume for 2+1 roads
based domestic two-lane highway conditions in highway planning aspects.” 62th Korean
Society of Transportation Conference, Korean Society of Transportation, Seoul, pp.
ii-421-426 (in Korean).