At the time the I-44 designation was assigned in Oklahoma in the 1950s, Oklahoma signed the mile markers west to east starting at Turner Turnpike's Oklahoma City terminus at the I-44/I-35 interchange (near Edmond). I-44 was extended in 1982 southwest of Oklahoma City along the existing H. E. Bailey Turnpike, thus raising the mile markers by about 100. The addition of the new section was unusual in that it is a more north–south segment and did not directly connect to the previous western end at I-35. It now extends south of I-40, an exception to the Interstate numbering rules and its end point does not connect to another Interstate Highway.