Aneurin Bevan Health Board says it has been receiving "walking wounded" casualties at the Royal Gwent Hospital's accident and emergency department in Newport after this morning's M4 crash.
A spokesperson for the health board confirmed ten casualties have been treated for minor injuries in Newport and one has been admitted with more serious injuries.
Two off-site triage centres were also set up in the area following the crash - one at St Julian's clinic and the other at Newport Centre.
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Well a fabulous day today has ended on a spectacularly soggy note for some! Heavy rain, hail and thunder will work northwards overnight!
The Talyllyn runs from Tywyn, near Aberdovey, for more than seven miles to two villages in the south Gwynedd countryside.
Homes in parts of Tonypandy and Llwynypia are without water this evening due to a burst water main at Cilfynydd.