sounds like the ideal solution would be something that makes crossing on foot or by vehicle at any point physically impossible.
ANY IDEAS GUYS??(http://www.autoadmit.com/thread.php?thread_id=4005818&forum_id=2#36274210)
*passes out post-its and sets up Kanban board*(http://www.autoadmit.com/thread.php?thread_id=4005818&forum_id=2#36274270)