How Dangerous Is Your Office?

At companies like Nestle and Chevron, safety is serious business. How serious? At the former, The Wall Street Journal reports, workers start meetings by looking for tripping hazards like stray extension cords; at the latter, employees can present a "stop work" card to halt activities, if they feel that a situation is unsafe. Other companies warn workers to beware of hazards like high heels, hot coffee, and carrying too many things while walking down stairs. Is all of this really beneficial to employees, or is it a (cautious, measured) step too far?