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.
More top news
As skies clear out there temperatures are tumbling away. In rural areas I'd expect a widespread grass frost!
The last time Wales reached the finals of a major tournament was the 1958 World Cup - and Swansea City legend Cliff Jones remembers it well.
Labour AM Jenny Rathbone says she's been sacked as chair of a committee after going public with concerns about the cost of plans for the M4.