ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti sˈɪks, wˈɛstbəs ɪstˈæblɪʃt ɐ sˈɛpɹət hˈɪlsbəs bɹˈænd tə ɹˈʌn ɛkspɹˈɛs sˈɜːvɪsᵻz fɹʌmðə hˈɪlz dˈɪstɹɪkt tə ðə sˈɪdni sˌiːbˌiːdˈiː ænd nˈɔːɹθ sˈɪdni, ɪnˈɪʃəli vˈaɪə ðɪ ˈænzæk bɹˈɪdʒ ænd fɹʌm nˈaɪntiːnhˈʌndɹɪd nˈaɪnti sˈɛvən vˈaɪə ðɪ ˈɛm tˈuː hˈɪlz mˈoʊɾɚwˌeɪ.
In 1996, Westbus established a separate Hillsbus brand to run express services from the Hills District to the Sydney CBD and North Sydney, initially via the Anzac Bridge and from 1997 via the M2 Hills Motorway.