Regulatory stop signs at intersections and street approaches are installed after careful consideration and in compliance with MUTCD guidelines. Over/unnecessary use of these stop signs can defeat their purpose and cause chaos in place of controlling traffic, and hence, the decision to install these is usually taken after consultation with local traffic control authorities, traffic engineers, or other relevant local bodies.  Other stop sign usage, for instance, to control traffic flow in parking lots, is a common way to prevent accidents and is not usually enforceable unless done after explicit authority permission.