As soon as you make it idiot proof-they will make a better idiot.
As I tell people at work: Always assume that everybody else are complete idiots and/or consciously trying to kill you.
In other words; the guy in the vehicle might run you down, the guy working overhead might drop something heavy or sharp, and the one strapping the load and building the scaffolding might be incompetent, hungover or both. Obviously, you learn to trust some people, but until they have earned that trust, you don't want to risk your life and health.
When rigging and unrigging, one should really follow the accepted guidelines from other industries and traditional behaviour in the theatre field (when there isn't a tension-grid), that the potential drop-zone is a no-go area that is either cordoned off, or controlled by only allowing one group of workers at a time. The problem with that is of course the time factor, so the next best thing is to learn a behaviour where everyone is alert and no one steps into a potential danger-zone.
~:-D~:grin: Thanks for the actual regs, though. Useful to know