|FHWA Policy Memorandums|
This attachment shows the design and dimensions for the rectangular Alternative 4-fuels plaque, which is designated as D9-11GP. It includes the image of the plaque that has a blue background and the fuel designation letters CNG, LNG, LPG and HYD in white, aligned horizontally in two rows on the plaque. "CNG – LPG" is evenly spaced on the top row, and "LNG – HYD" is evenly spaced on the bottom row.
LEGEND, BORDER - WHITE (RETROREFLECTIVE)
BACKGROUND - BLUE (RETROREFLECTIVE)
United States Department of Transportation - Federal Highway Administration