Problem of number of useful colors was considered by National Joint Committee on Uniform Traffic Control Devices; conclusion is that optimum color code for highway use consists of 12 colors; red, yellow, green, blue, black and white are assigned meanings entirely consistent with traditional use; two new colors -- purple and brown -- are added for specific application and another color -- orange is assigned to new and broader use; three other colors are identified and reserved for future uses.
Color in traffic control
Traffic Eng
Traffic Engineering ; 37 , n 8
1967
5 pages
Article (Journal)
English
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