The A465 Heads of the Valleys Road is blocked Westbound between the Rhigos Roundabout and Glynneath Interchange.
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Wales' Finance Minister told ITV Cymru Wales that young people looking for their first jobs will "struggle".
A dry start with some cloud in across the west. There will be plenty of sunshine throughout the day and it will feel warmer than Sunday.
It comes as police forces have warned people to avoid beauty spots on bank holiday Monday as temperatures reach 20°C in parts of Wales.