Hein, D., Strecker, E., Poresky, A. and Roseen, R. (2013a). Permeable shoulders with
stone reservoirs, American Association of State Highway and Transportation Officials
(AASHTO), NCHRP Project 25-25, Task 82, National Cooperative Highway Research Program,
Transportation Research Board, Washington, DC.Hein, D., Strecker, E., Poresky, A.
and Roseen, R. (2013a). Permeable shoulders with stone reservoirs, American Association
of State Highway and Transportation Officials (AASHTO), NCHRP Project 25-25, Task
82, National Cooperative Highway Research Program, Transportation Research Board,
Washington, DC.