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.
2017-05-13T18:24:51-04:00. A merging traffic sign is an example of a B, Warning sign. Regulatory signs instruct drivers what they should or shouldn't do.. An example would be a left-turn only sign. Guide signs provide directional and mileage information to specific destinations..