dˈʊɹɹɪŋ ðɪs pɹˈɑːsɛs, ðɪ ˌɛsˈɑːɹ twˈɛlv dˌɛzɪɡnˈeɪʃən ɐlˈɔŋ lˈɑːɡɐndˌeɪl ɹˈoʊd wʌz pɹəpˈoʊzd təbi kəmbˈaɪnd wɪððɪ ˌɛsˈɑːɹ fˈoːɹɾi dˌɛzɪɡnˈeɪʃən ɐlˈɔŋ vˈæli ʌv fˈaɪɚ ɹˈoʊd tə kɹiːˈeɪt ɐ nˈuː stˈeɪt ɹˈaʊt wˈʌnhˈʌndɹɪd sˈɪksti nˈaɪn, lˈiːvɪŋ ðə ɹˈʌfli sˈaʊθiːstɚn ˈɛdʒ æz ˌɛsˈɑːɹ twˈɛlv.
During this process, the SR 12 designation along Logandale Road was proposed to be combined with the SR 40 designation along Valley of Fire Road to create a new State Route 169, leaving the roughly  southeastern edge as SR 12.