Fe deithiodd 32,000 gerbydau dros y bont bob dydd yn 2024, gyda 3,270 ohonyn nhw’n gerbydau trwm.
Mae hynny’n golygu bydd rhyw 10% o gerbydau’n gorfod defnyddio’r bont newydd.
Mae cwmnïau cludiant wedi rhybuddio y gallai’r dargyfeirio achosi “hunllef” ar adegau prysur.
Mae cwmni Jaga Brothers, sydd wedi’i leoli ym Magwyr, yn anfon rhwng 40 a 50 o loriau dros y pontydd yn ddyddiol.
Fe fydd y rheiny sy’n defnyddio’r M48 fel arfer, yn gorfod teithio 13 milltir i gyrraedd yr M4.
“Mae’n mynd i fod yn annibendod,” meddai Darren Hobbs, sy’n rheolwr cludiant i’r cwmni.
“Mae tipyn o’n gwaith ni yn dibynnu ar ddosbarthu o fewn amser.
“Fe fyddwn ni’n gorfod cysylltu â chwsmeriaid i ymddiheuro a dweud na fyddwn ni yno mewn pryd.”
BBC News
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