The Order will impose temporary 30 mph, 40 mph and/or 50 mph speed limits on lengths of the A470 trunk road between Coryton and Merthyr Tydfil when work is 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 gefnffordd yr A470 rhwng Coryton a Merthyr Tudful pan fydd angen gwneud gwaith mewn safle penodol.