ˌɔn fˈɛbɹuːˌɛɹi twˈɛnti sˈɛvən, nˈaɪntiːnhˈʌndɹɪd fˈɪfti ˈeɪt, ðə ɹᵻmˈeɪndɚɹ ʌvðə ɹˈaʊt wʌz ɹᵻnˈʌmbɚd æz ˌɛsˈeɪtʃ ˈeɪtiːn, tə koʊˈɔːɹdɪnˌeɪt wɪð ɪts ˌɪntɚsˈɛkʃən wɪð nˈuː mˈɛksɪkˌoʊ stˈeɪt ɹˈoʊd ˈeɪtiːn.
On February 27, 1958, the remainder of the route was renumbered as SH 18, to coordinate with its intersection with New Mexico State Road 18.