Mae gwaith ar y cynllun yn cael ei wneud mor gyflym ag y bo modd heb effeithio ar ddiogelwch, a gall teithwyr barhau i wirio diweddariadau ar Draffig Cymru wrth i'r gwaith fynd rhagddo.
The scheme is progressing as fast as it safely can and travellers can continue to check updates on Traffic Wales while it is ongoing.