The primary output of the scheme is the replacement of the at-grade roundabouts with grade-separation as a means of enhancing resilience against significant delay caused by incidents.
Prif allbwn y cynllun yw gwahanu lefelau cyffyrdd gan gael gwared ar gylchfannau un-lefel fel ffordd o wella cydnerthedd yn erbyn oedi sylweddol a achosir gan ddigwyddiadau.