Bydd lonydd tua’r dwyrain a thua’r gorllewin ar gau am bedair wythnos o 28 Medi ymlaen, gyda’r gerbytffordd ar gau yn gyfan gwbl dros nos am bythefnos o 8 Tachwedd ymlaen. Bydd ffordd ymuno tua’r dwyrain a ffordd ymadael tua’r gorllewin cyffordd 27 hefyd ar gau pan fo angen.
Eastbound and westbound lane closures are programmed to be in place for four weeks from 28 September, with full overnight carriageway closures due to take place for two weeks from 8 November. The junction 27 eastbound on-slip and westbound off-slip will also be closed when needed