FDA Opposes Medical Use of Marijuana. April 21, 2006 -- The FDA has issued a statement rejecting the medical use of marijuana. The FDA's statement doesn't mention any new research on the topic. Instead, it cites a past evaluation by several U.S. Department of Health and Human Services agencies, including the FDA.
Standard Sign Shapes. Signs convey information to travelers not only by their messages and color, but through their shape as well. Special shapes are specifically assigned to certain types of signs so that travelers can recognize them quickly and react appropriately. In general, the greater number of sides on a sign, the more critical a message it conveys. This is why a circular shape was adopted for the Railroad Advance warning sign (i.e. infinite number of sides), as a collision between a train and a typical vehicle will nearly always end badly.
1 The variability in human dimensions should be considered when placing warning signs. 2  For example, a warning sign that is clearly visible to someone who is 5 ft 5 might not be visible to someone who is 6 ft 5, or vice versa.on-Verbal Auditory warnings. 1  All employees and contractors on site should know what each alarm means and what the required response is, if the cause of the alarm has the potential to affect them. 2  When an alarm triggers it should provide enough time to effect recovery where applicable.