The biggest speed is the speed of light.
ð ə WORD_BOUNDARY b ɪ ɡ ɪ s t WORD_BOUNDARY s p iː d WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY s p iː d WORD_BOUNDARY ʌ v WORD_BOUNDARY l aɪ t WORD_BOUNDARY