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
Considering we are well into summer now, it's all very disappointing out there at the moment! Rather on the chilly side!
Plaid Cymru leader Leanne Wood says her party must campaign for Welsh independence, rather than be part of a UK outside the European Union.
Ali Ahmed, who has lived in the city for 38 years, says he was racially abused in the street following last week's EU referendum vote.