ðɪs ˈɑːptɪməm lˈaɪn mˈeɪ vˈɛɹi dᵻpˈɛndɪŋ ˌɔn wˈɛðɚɹ ɐ dɹˈaɪvɚ wˈɪʃᵻz tʊ ɐtʃˈiːv ɐ mˈɪnɪməm lˈæp tˈaɪm dˈʊɹɹɪŋ ɐ kwˈɔlᵻfˌaɪɪŋ sˈɛʃən, kənsˈɜːv tˈaɪɚz ænd fjˈuːəl, ɔːɹ fˈɛnd ˈɔf ɐ pˈæs fɹʌm ɐnˈʌðɚ dɹˈaɪvɚ dˈʊɹɹɪŋ ɐ ɹˈeɪs.
This optimum line may vary depending on whether a driver wishes to achieve a minimum lap time during a qualifying session, conserve tires and fuel, or fend off a pass from another driver during a race.