Nocte wrote:I wonder if you could roll those big wooden spools (from the parking lot, and elsewhere) over the holes. Those are heavy enough that they wouldn't slide around much, and they'd provide a little cover in areas that are normally wide open.
My worry is that they move and if people accidentally move them when using them for cover, you now have a piece of cover (attracts people near it) right next to a hole that is possibly unseen from many angles.
I'd suggest a flat piece of OSB or particle board over the top of them that has bright markings on it.