Fuel protesters previously brought disruption to a number of major roads in Northern Ireland 10 days ago on Tuesday, April 14.
Slow-moving convoys of tractors and other vehicles formed in Belfast and several other areas as part of protests against rising energy bills.
At around noon, a convoy of slow-moving tractors clogged up the Sydenham bypass near Belfast City Airport, hours after passengers were warned there may be disruption.
It then travelled down the bypass in the direction of Bangor towards Belfast City Airport, with some cars undercutting them on the cycle route to get past on the inside.
A number of people were seen walking at the side of the road in an effort to get to the airport.
Later in the day, scores of tractors, trucks and lorries took part in a convoy along the A1.
The tractors and other vehicles, many with flashing lights and blaring horns, travelled past Hillsborough in Co Down in the direction of Belfast before turning at the Sprucefield roundabout and moving south.
In Omagh, in Co Tyrone, around 15 tractors and other vehicles moved through the centre of the town.
Dozens of vehicles also took part in a convoy at the Ballygawley roundabout.
There were also reports of a smaller protest at Nutts Corner in Antrim.