Rhode Island route marker. Square markers are 24 × 24 inches (610 × 610 mm) and wide markers are 30 × 24 in (760 × 610 mm). The R.I. legend is 4 inches (100 mm) high and the numbers are 12 inches (300 mm) high.
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
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