Tredegar Park roundabout in Newport (junction 28) will be closed from 20:00 until the end of service on Thursday 23rd March and again on Friday 24th March.
During this time, Cardiff Bus service 30 will divert as follows:
Buses travelling towards Newport
Buses will follow their normal route from Cardiff to Celtic Springs Business Park then divert via Pencarn Way, Duffryn Way and Lighthouse Road before returning to their normal route at Cardiff Road into Newport.
Buses travelling towards Cardiff
Buses will follow their normal route from Newport bus station to the Office for National Statistics roundabout, then divert via Lighthouse Road, Duffryn Way and Pencarn Way before returning to their normal route into Cardiff at the A48.