There are no options listed, but a can cite a few reasons why companies use graphic signs:
statistically, the number of work related injuries decrease as the level of safety signage increases.
visual signs are extremely effective ways of communicating, and when it comes to dangerous activities, their effectiveness increases.
people tend to pay more attention to graphic signs than to written signs, that is the same reason why signs and logos are placed outside a company in order to identify it.
graphic signs are very easy to recognize and associate.
graphic signs do not need further or complex explanations, i.e. a picture is worth more than 1,000 words.
