æt nˈaɪt, lˈaɪt fɹʌm ˈiːtʃ ɐpɹˈoʊtʃɪŋ vˈiəkəlz hˈɛdlæmps stɹˈaɪks ðə ɹˌɛtɹoʊɹᵻflˈɛktɪv bˈʌʔn̩z ænd ɪz ɹᵻflˈɛktᵻd bˈæk təwˈɔːɹdz ðɪ ˈaɪz ʌvðə vˈiəkəlz dɹˈaɪvɚ.
At night, light from each approaching vehicle's headlamps strikes the retroreflective buttons and is reflected back towards the eyes of the vehicle's driver.