At most sections, the Federal Route 66 was built under the JKR R5 road standard, allowing maximum speed limit of up to 90 km/h.
æt mˈoʊst sˈɛkʃənz, ðə fˈɛdɚɹəl ɹˈaʊt sˈɪksti sˈɪks wʌz bˈɪlt ˌʌndɚ ðə dʒˌeɪkˌeɪˈɑːɹ ˈɑːɹ fˈaɪv ɹˈoʊd stˈændɚd, ɐlˈaʊɪŋ mˈæksɪməm spˈiːd lˈɪmɪt ʌv ˌʌp tə nˈaɪnti kˌeɪˈɛm slˈæʃ ˈeɪtʃ.