One unique feature of the Alaska Highway system is the Anton Anderson Memorial Tunnel, an active Alaska Railroad tunnel recently upgraded to provide a paved roadway link with the isolated community of Whittier on Prince William Sound to the Seward Highway about  southeast of Anchorage at Portage.
wˈʌn juːnˈiːk fˈiːtʃɚɹ ʌvðɪ ɐlˈæskə hˈaɪweɪ sˈɪstəm ɪz ðɪ ˈæntɑːn ˈændɚsən məmˈoːɹɪəl tˈʌnəl, ɐn ˈæktɪv ɐlˈæskɚ ɹˈeɪlɹoʊd tˈʌnəl ɹˈiːsəntli ʌpɡɹˈeɪdᵻd tə pɹəvˈaɪd ɐ pˈeɪvd ɹˈoʊdweɪ lˈɪŋk wɪððɪ ˈaɪsəlˌeɪɾᵻd kəmjˈuːnᵻɾi ʌv wˈɪɾɪɚɹ ˌɔn pɹˈɪns wˈɪljəm sˈaʊnd tə ðə sˈuːɚd hˈaɪweɪ ɐbˌaʊt sˈaʊθiːst ʌv ˈæŋkɚɹɪdʒ æt pˈoːɹɾɪdʒ.