ɪn tˈuː θˈaʊzənd sˈɪkstiːn, ɐ fˈaɪvjˈɪɹ plˈæn tə ɹᵻnˈuː ðə mədʒˈɔːɹᵻɾi ʌvðə flˈiːt wʌz ɐnˈaʊnst, wɪððɪ ˈeɪm ʌv nˈoʊ vˈiəkəl ɪnðə flˈiːt bˌiːɪŋ ˈoʊldɚ ðɐn fˈaɪv jˈɪɹz ˈoʊld ɪn tˈuː θˈaʊzənd twˈɛnti.
In 2016, a five-year plan to renew the majority of the fleet was announced, with the aim of no vehicle in the fleet being older than five years old in 2020.