Encyclopedia - D.o.t. Pictograms: Encyclopedia - D.o.t. Pictograms
The pictograms or "symbol signs" used by the United States Department of Transportation (DOT) are intended to convey information useful t...   » Read the article

Encyclopedia - D.o.t. Pictograms: Encyclopedia Ii - D.o.t. Pictograms - History
In 1974, the DOT, recognizing the shortcomings of pictograms drawn on an ad hoc basis across the United States interstate highway system,...   » Read the article

Encyclopedia - Pictogram: Encyclopedia - Pictogram
A pictogram or pictograph is a symbol representing an object or concept by illustration. Pictography is a form of writing whereby ideas a...   » Read the article