Creating restricted areas is a safety measure that employers take to protect their employees and prevent sensitive information from falling into the wrong hands. These areas often contain processes or systems that require well-trained personnel to operate. There may also be hazards such as falling objects, harmful substances, emissions and radiation, electrical current, etc., that necessitate the use of proper PPE, thereby limiting access to certain workers only who have received adequate safety training.  Areas like data centers are also marked restricted as these often contain confidential information about employees, customers, the general public, business operations, and finance, and so on. Any misuse of such information could result in a loss of reputation, money, and more for a business, and hence, it is protected by limiting access rights.