Cars, vans and lorries will be banned from two Brighton streets from today (Saturday 30 May).
East Street will be pedestrianised every weekend from today.
And Ship Street will be pedestrianised between North Street and Ship Street from 11am each day.
Brighton and Hove City Council said: “East Street will be pedestrianised on Saturdays and Sundays from 11am to 7pm under a trial scheme.
“The aim is to create a more pleasant environment for the thousands of shoppers and others who walk through the street at weekends.
“The trial will last for up to 18 months and during this time the council will monitor and assess its effect and make a decision whether to make the arrangement permanent at the end of the trial.
“Between 11am and 7pm no motor vehicles will be permitted in the pedestrianised section.
“Any motor vehicles remaining in the street will receive a penalty notice and will not be able to exit the area until 7pm.
“During these times the pedestrianisation restriction on Little East Street will be lifted to allow motor vehicles to exit the area. Cycling will continue to be permitted at all times.”
Objections can be made within six months of the relevant traffic order coming into force, which is Sunday 22 November.