Buses and taxis have been banned from driving through the King Street and New Street junction as part of a new trial aimed at making the town centre safer for people on foot.
The change came into force today after Infrastructure Minister Andy Jehan signed off on a 12-month trial to turn the area into a pedestrian-priority zone.
Only bicycles and commercial delivery vehicles – and only between 20:00 and 10:00 – will be allowed to cross the junction via New Cut.
The move is part of a wider plan to make the town centre easier to walk around and cut down on traffic.
According to the governemnt, a recent survey showed that during the busiest shopping hours (10:00 to 16:00), half the vehicles using the route were taxis and about 8% were buses.
By cutting access for those vehicles, the government says it wants to make the junction safer and less congested.
The government is still in talks with LibertyBus and the taxi industry and is working on plans to find new taxi ranks in town.
The rank at Library Place will stay in place.
Work is also being done with disabled minibus services and the Parish of St Helier to make sure people who need extra support can still get around.
The government added that the number of Blue Badge parking spaces in the area has been increased, and that work is ongoing to improve facilities.
More detail on the changes to New Street is expected to be published by the government next week.