ɪt hɐz tɹˈævəld ɪts pɹˈɛzənt kˈoːɹs sˈɪns ðˈɛn, ɛksˈɛpt fɚðɪ ɐdˈɪʃən ʌvðə nˈɔːɹðɚn pˈoːɹʃən ʌv ˌɛsˈeɪtʃ ˈeɪtiːn bᵻtwˌiːn tˈɜːki ænd ˈɛstɪlˌaɪn ˌɔn dᵻsˈɛmbɚ twˈɛnti tˈuː, nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɪks.
It has travelled its present course since then, except for the addition of the northern portion of SH 18 between Turkey and Estelline on December 22, 1936.