Blockades of fuel depots in Limerick and Galway, as well as at the country's only refinery in Cork, are leading to fuel shortages countrywide.
Hundreds of service stations, mostly in the south and west of the country, have already run out of diesel and petrol.
The National Emergency Coordination Group (NECG) said today that the three national fuel depots at Whitegate Refinery, Shannon Foynes Port, and the Port of Galway remain restricted due to the blockades, and movement at the three sites is extremely limited.
There is plenty of fuel available, but with protests at the terminals in Limerick and Galway, and at the Whitegate Refinery in Cork, most of it cannot get to where it is needed.
Sitting in Galway Bay is the Thun Gemini - a tanker with six million litres of fuel. It cannot be unloaded at the port because of full storage tanks.
And the disruption is spreading. Dublin Port is accessible but slow-moving convoys around the capital are causing problems with restocking service stations on the east coast.
Fuels for Ireland said that 500 service stations across the country could be without fuel by tonight.
The NECG heard that there are approximately 1,500 fuel stations nationwide.
And even if the blockades end, it could take a week for normal supply lines to be restored.
Meanwhile, protesters have been engaged in a standoff with the Garda Public Order Unit at the oil refinery in Whitegate in Cork.
Gardaí have been trying to escort a third tanker into the country's only oil refinery.
Blockades remain in place around the country today causing disruptions and delays on many national roads.
There was lengthy queues for northbound traffic on the M1 due to fuel protesters closing the motorway at Dundalk.
In Dublin, parts of the M50 northbound and southbound were blocked and there was issues around the N7 but (Transport Infrastructure Ireland) TII said delays were not as prolonged as yesterday due to reduced volumes on the road network.
At least 60 tractors, trucks and buses remain parked on O'Connell Street but the opening of the north and south quays, along with the operation of the Luas outside of O'Connell Street, meant a lot more people and cars were moving around the city centre today.
Dublin Bus continues to operate curtailed services in the city centre but said that passenger numbers are down significantly.
Delivery service DPD Ireland has temporarily suspended services in the Republic of Ireland from tomorrow.
Earlier, protesters at the fuel depot at the Port of Foynes facilitated five fuel trucks to pass the blockade.
The fuel trucks were the first to leave the depot in four days.
The protesters said the reason they allowed the fuel trucks to leave was because the fuel was for use by the emergency services.
They also facilitated trucks carrying animal feed and chemicals for the treatment of drinking water to leave the port and there has been a steady and constant stream of trucks driving in and out of the port today.
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