As predicted by research, soon after the motorway opened in 1986 traffic levels exceeded maximum designed capacity. In 1990 the Secretary of State for Transport announced plans to widen the whole of the M25 to four lanes. By 1993 the motorway that was designed for a maximum of 88,000 vehicles per day was carrying 200,000. 15% of UK motorway traffic volume was on the M25 and there were plans to add 6 lanes to the section from Junction 12 to 15 as well widening the rest of the motorway to 4 lanes.
æ z WORD_BOUNDARY p ɹ ɪ d ɪ k t ɪ d WORD_BOUNDARY b aɪ WORD_BOUNDARY ɹ ɪ s ɜː t̠ʃ WORD_BOUNDARY s uː n WORD_BOUNDARY æ f t ə ɹ WORD_BOUNDARY ð ə WORD_BOUNDARY m oʊ t ə ɹ w eɪ WORD_BOUNDARY oʊ p ə n d WORD_BOUNDARY ɪ n WORD_BOUNDARY n aɪ n t iː n h ʌ n d ɹ ɪ d WORD_BOUNDARY eɪ t i WORD_BOUNDARY s ɪ k s WORD_BOUNDARY t ɹ æ f ɪ k WORD_BOUNDARY l ɛ v ə l z WORD_BOUNDARY ɛ k s iː d ɪ d WORD_BOUNDARY m æ k s ɪ m ə m WORD_BOUNDARY d ɪ z aɪ n d WORD_BOUNDARY k ə p æ s ɪ t i WORD_BOUNDARY ɪ n WORD_BOUNDARY n aɪ n t iː n h ʌ n d ɹ ɪ d WORD_BOUNDARY n aɪ n t i WORD_BOUNDARY ð ə WORD_BOUNDARY s ɛ k ɹ ə t ɹ i WORD_BOUNDARY ʌ v WORD_BOUNDARY s t eɪ t WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY t ɹ æ n s p ɔ ɹ t WORD_BOUNDARY ʌ n aʊ n s t WORD_BOUNDARY p l æ n z WORD_BOUNDARY t ə WORD_BOUNDARY w aɪ d ə n WORD_BOUNDARY ð ə WORD_BOUNDARY h oʊ l WORD_BOUNDARY ʌ v ð ɪ WORD_BOUNDARY ɛ m WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY f aɪ v WORD_BOUNDARY t ə WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY l eɪ n z WORD_BOUNDARY b aɪ WORD_BOUNDARY n aɪ n t iː n h ʌ n d ɹ ɪ d WORD_BOUNDARY n aɪ n t i WORD_BOUNDARY θ ɹ iː WORD_BOUNDARY ð ə WORD_BOUNDARY m oʊ t ə ɹ w eɪ WORD_BOUNDARY ð æ t WORD_BOUNDARY w ʌ z WORD_BOUNDARY d ɪ z aɪ n d WORD_BOUNDARY f ə ɹ ɹ ə WORD_BOUNDARY m æ k s ɪ m ə m WORD_BOUNDARY ʌ v WORD_BOUNDARY eɪ t i WORD_BOUNDARY eɪ t WORD_BOUNDARY z iə ɹ oʊ z iə ɹ oʊ WORD_BOUNDARY z iə ɹ oʊ WORD_BOUNDARY v iə k ə l z WORD_BOUNDARY p ɜː WORD_BOUNDARY d eɪ WORD_BOUNDARY w ʌ z WORD_BOUNDARY k æ ɹ i ɪ ŋ WORD_BOUNDARY t uː h ʌ n d ɹ ɪ d WORD_BOUNDARY z iə ɹ oʊ z iə ɹ oʊ WORD_BOUNDARY z iə ɹ oʊ WORD_BOUNDARY f ɪ f t iː n WORD_BOUNDARY p ə ɹ s ɛ n t WORD_BOUNDARY ʌ v WORD_BOUNDARY j uː k eɪ WORD_BOUNDARY m oʊ t ə ɹ w eɪ WORD_BOUNDARY t ɹ æ f ɪ k WORD_BOUNDARY v ɑ l j uː m WORD_BOUNDARY w ʌ z WORD_BOUNDARY ɔ n ð ɪ WORD_BOUNDARY ɛ m WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY f aɪ v WORD_BOUNDARY æ n d WORD_BOUNDARY ð ɛ ɹ w ɜː WORD_BOUNDARY p l æ n z WORD_BOUNDARY t ʊ WORD_BOUNDARY æ d WORD_BOUNDARY s ɪ k s WORD_BOUNDARY l eɪ n z WORD_BOUNDARY t ə WORD_BOUNDARY ð ə WORD_BOUNDARY s ɛ k ʃ ə n WORD_BOUNDARY f ɹ ʌ m WORD_BOUNDARY d̠ʒ ʌ ŋ k ʃ ə n WORD_BOUNDARY t w ɛ l v WORD_BOUNDARY t ə WORD_BOUNDARY f ɪ f t iː n WORD_BOUNDARY æ z WORD_BOUNDARY w ɛ l WORD_BOUNDARY w aɪ d ə n ɪ ŋ WORD_BOUNDARY ð ə WORD_BOUNDARY ɹ ɛ s t WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY m oʊ t ə ɹ w eɪ WORD_BOUNDARY t ə WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY l eɪ n z WORD_BOUNDARY