Conversations with industry suggest that a significant amount of unready traffic is also choosing to remain in warehouses or depots rather than heading to ports.
Mae trafodaethau gyda diwydiannau’n awgrymu bod cryn dipyn o draffig heb y ddogfennaeth briodol hefyd yn dewis aros mewn warysau neu ddepos yn hytrach na mynd i borthladdoedd.