Antonio Carraro, Emily Budagher, Mahir Badanagki, Jong Beom Kang.
"Sponsored by the Colorado Department of Transportation In Cooperation with the U.S. Department of Transportation, Federal Highway Administration."
"July 2013."
Bibliography: pages 22-24.
Report No. CDOT-2013-2
Final Report.
Online resource; title from PDF cover (viewed March 2016)