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.
The distance between the edge of the pavement and the near edge of the sign is shown as a dimension not less than 1.8 m (6 ft). The second illustration is labeled Roadside Sign Rural District.. The road is shown with a shoulder. The sign in this example is a Curve Warning sign. The distance from the bottom edge of the sign to the level of the edge of the travel lane at the inside edge of the shoulder is shown as a dimension not less than 1.5 m (5 ft).