ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi fˈaɪv, ðə wˈɛst ˈɛnd ʌvðɪ ˌeɪ fˈoːɹhˈʌndɹɪd nˈaɪntiːn wʌz ɹᵻɹˈaʊɾᵻd vˈaɪə stɹˈaʊd, tˈeɪkɪŋ ˌoʊvɚ ðɪ ɛntˈaɪɚ lˈɛŋθ ʌvðɪ ˌeɪ fˈoːɹ θˈaʊzənd twˈɛnti, wˌɪtʃ nˈʌmbɚɹ ɪt ɹᵻmˈeɪnz.
In 1935, the west end of the A419 was rerouted via Stroud, taking over the entire length of the A4020, which number it remains.