This is a H3 Interstate highway shield, directional route sign, aluminum backed sign with white silk screen letters on blue sheeting of High Intensity grade reflectivity.
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MUTCD Section 2D.11 Design of Route Signs Standard: The "Standard Highway Signs" book (see Section 1A.11) shall be used for designing route signs. Other route sign designs shall be established by the authority having jurisdiction. Interstate Route signs (see Figure 2D-3) shall consist of a cutout shield, with the route number in white letters on a blue background, the word INTERSTATE in white capital letters on a red background, and a white border. This sign shall be used on all Interstate routes and in connection with route sign assemblies on intersecting highways. A 600 x 600 mm (24 x 24 in) minimum sign size shall be used for Interstate route numbers with one or two digits, and a 750 x 600 mm (30 x 24 in) minimum sign size shall be used for Interstate route numbers having three digits. M1-1 is shown as a cutout shield with a white border. In the top fourth of the shield, the word "INTERSTATE" is shown in white on a red background above a horizontal white line that extends across the width of the sign. Below the line, the large numerals "22" are shown in white on a blue background. The sign is labeled "Interstate Route Sign."
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