The annual Lundy’s Day parade in Derry is due to begin in just over an hour.
And police have warned motorists of traffic delays in the city on Saturday parade takes place.
Bands and Apprentice Boys will gather at the railway station in the Waterside for a parade that is scheduled to start at 11.40am.
The route will take the procession along Duke Street to cross Craigavon Bridge and along Carlisle Road, Hawkin Street, London Street, Bishop Street and Society Street to the Apprentice Boys’ Memorial Hall.
At about 1.15pm, the parade will reform to process via Society Street, Bishop Street, the Diamond, Ferryquay Street, Wapping Lane, Kennedy Street, Harkin Street and London Street for a service in St Columb’s Cathedral.
At about 3pm, the bands and clubs will follow a reverse route from the cathedral to Bishop Street for the burning of an effigy.
At 4.15pm, the bands and clubs will parade from Bishop Street via London Street, Hawkin Street and Carlisle Road to return to the Waterside for dispersal.
“No roads will be closed during the day, but motorists are advised to expect delays while parades are in progress,” a PSNI spokesman said.
The event marks the 327th anniversary of the shutting of the gates that preceded the siege of Derry.