It is fairly easy to walk through a work area and take a quick look at the obvious, in-plain-view items and find potential hazards. However, many hazards are behind closed doors or electrical panel doors, in drawers and toolboxes, behind and under desks and cabinets, above us and below us (think underground and above ground utilities!), inside of a pipe line (unexpected pressure!) and otherwise just not in plain sight. Working surfaces may not be structurally sound, guardrails and walls may not support the intended load, other people may walk under a grating or pipe chaise and be exposed to dropped objects, a weather pattern may develop on the other side of the tanks or towers and an exit door may hide a restricted means of egress on the other side of that door.
