Residents and traders in Port Talbot fear the closure of the junctions would lead to the town being 'cut off' from business.
Steve Redmore, manager of Aberafan Shopping Centre, said the closure would restrict people coming into the town, which is not needed in the current economic climate.
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It'll be a mostly dry and bright start to the day. However, cloud and rain will move in from the west during the afternoon, heavy at times.