The south end of Green Street will be one-way permanently.
Traffic will only be able to travel from Havre des Pas to the roundabout, and not in the opposite direction after St Helier Deputy Russell Labey won a States vote 28-19.
He says the changes will 'put residents before commuters' and the area has been a problem for too long:
"The situation that the families living on the street, in that area where it pinches, has been absolutely dreadful. Not just for the five years I've been a Deputy and they've been talking about it. But for five years before that, and before that."
The Infrastructure Minister, who opposed the idea, now has to work to deliver the changes.
The proposed restrictions will be familiar to St Helier residents, with the part of Green Street due to be closed already shut for several weeks because of roadworks.
Commonwealth Games: Nowacki into 100m breaststroke final
Channel Islands face 'physical' Poland test
Thousands expected at Havre Des Pas Festival this weekend
Price of heating oil and other fuel increase by more than half in a year
Man jailed for importing nearly £600k worth of cannabis in bumpers of his car
Baby born on Guernsey's Marine Ambulance
Drug trafficker who claimed he was the ‘Accredited Dealer' jailed
Jersey men involved in cocaine importation sentenced
