The mark consists of a large shaded semi-circle with a dark outline in the center of the mark, containing the image of a road sign. The road sign contains the stylized words ROUTE in the top portion and US 66 in the bottom portion, with a dark line separating the top and bottom portions. The road sign partially protrudes into a horizontal rectangle below. The horizontal rectangle contains the word MIDPOINT. The letter P is partially covered by the bottom tip of the road sign. The rectangle has a dark outline. Above the large shaded semi-circle in the middle of the mark is a thick curved and shaded band in the shape of a semi-circle, containing the words ADRIAN, TEXAS, with dark outlines both inside and outside of the band. There is a thin dark border surrounding the outside of the entire mark.
Color is not claimed as a feature of the mark.