The M4 CEM Consultation which asked participants to comment on a range of options contributing towards a strategy to reduce traffic congestion on the M4 around Newport ran between March and July 2012.
Roedd yr ymgynghoriad yn gofyn i bobl roi eu sylwadau ar amrywiaeth o opsiynau sy’n cyfrannu at strategaeth i leihau tagfeydd traffig ar yr M4 o amgylch Casnewydd.