The Order will temporarily impose temporary 30 mph, 40 mph and/or 50 mph speed limits on lengths of the M4 motorway between Junctions 34 and 49 when works are needed at a particular site.
Bydd y Gorchymyn yn gosod terfyn cyflymder o 30 mya, 40 mya a/neu 50 mya dros dro ar ddarnau o draffordd yr M4 rhwng Cyffyrdd 34 a 49 pan fydd angen gwneud gwaith mewn safle penodol.