The number of garage forecourts without fuel in Ireland could rise to 500 by Friday night if blockades continue, according to the CEO of Fuels for Ireland.

Kevin McPartlan said more than 100 garages are currently without fuel but said the number will rise if the situation is not resolved.

Travel across parts of the Republic of Ireland has been affected for the fourth day in a row as slow-moving convoys made up of vehicles, including tractors, have been blocking roads in protest against high fuel prices caused by the US and Israeli war against Iran.

Irish government officials have been meeting with representative bodies on Friday to try to resolve the situation.

Taoiseach (Irish prime minister) Micheál Martin said that the blockades mean the country is “on the precipice of turning oil away from the country” amidst a global oil supply crisis.

There are long queues on the M1, heading towards the border with Northern Ireland, due to protesters closing the motorway at Dundalk, with vehicles blocking both lanes at the Carlingford turnoff, Irish broadcaster RTÉ is reporting.

The National Emergency Coordination Group (NECG), which brings together government departments and state agencies to coordinate emergency response, said fuel supplies for emergency response vehicles, including the ambulance service and fire service, are under “increasing pressure”.

In a statement, they said: “These vehicles rely on retail fuel forecourts for their fuel supply through the use of fuel cards.”

Ministers at the meeting have said no further support measures will be announced until the blockages end, RTÉ is reporting.

Fine Gael TD Peter Roche travelled to the meeting with some of the protesters.

He said there was a “general consensus that one, if not two, of them would be allowed to attend” and that he was disappointed when they were not allowed to enter.

Kildare farmer John Dallon said the protests could continue for “maybe for another week, maybe two weeks. If it takes a month, we are prepared to sit here.”

He said it had been his understanding that he had been invited to the meeting, but was refused entry.

He said he is hopeful that government proposals to deal with high fuel costs would resolve the crisis.

Sinn Féin leader Mary Lou McDonald said: “What on earth are Fianna Fáil and Fine Gael doing locking the protesters out of the talks.”

In a post on social media, she said the two coalition parties are “making an absolute shambles of things,” adding that they were “escalating” the crisis.

Mary Burke told the Evening Extra programme, that the service station she manages, received a supply of petrol and diesel on Thursday.

The supply, which she said would typically last the Raceside Service Station four to five working days, had ran out within seven hours.

A second supply was delivered to the County Tipperary station on Friday, but a €30 (£26) cap was implemented for customers.

Another supply is due to arrive on Monday, but Burke said there’s no guarantee she will receive the delivery.

“I’m 100% going to run out of fuel before Monday.”

Burke said she’s making no money on the fuel and instead the business is just “providing a service”.

“I’m dreading Saturday evening, Sunday morning when I’m going to run out of fuel,” she said, adding that staff will be affected.

The Chief Executive of Home and Community Care Ireland said many of their staff who rely on cars to travel between home care appointments are struggling to access fuel supplies.

Joseph Musgrave said he is being “flooded” with reports from staff “particularly around the mid-west, but also up as far as Donegal, Cork, Kerry, Waterford, Tipperary”.

“On any given day nationally, our carers will call around 15 to 25 ambulances because they’ve gone to attend their client and their client needs help.

“If they can’t get to their client, then those ambulances can’t be called. And we all know what that means.”

The army was asked on Thursday to remove vehicles blocking roads, with the Irish police treating protests at fuel depots as “blockades”.

Micheál Martin told RTÉ that the blockade “is damaging Ireland’s economy and society”, and that “self-appointed” groups do not have a right to “close down the country”.

He added that the Irish army “is on standby” to make sure the “law is upheld”.

As well as blocking roads, protesters are in place at fuel terminals in Foynes in County Limerick, as well as at Galway Port and a blockade continues at the Whitegate Oil Refinery in east Cork.

Gardaí (Irish police) said they secured access to the National Critical Infrastructure site at Whitegate, where there was no disorder.

On Friday afternoon, RTÉ reported that five fuel trucks passed through the blockade but said protesters have said no further tankers are permitted.

The Irish Minister for Justice, Jim O’Callaghan, said there would be “legal consequences” for some protests.

“It might not arise today or tomorrow but people have licences to drive vehicles, those licences will be affected.”

The Irish Health Service Executive called for all approaches to medical facilities to be kept clear for people to access treatment and the President of the Irish Medical Organisation, the trade union body, Prof Matthew Sadlier said that potential missed appointments due to the blockades were having a “hugely detrimental” effect on patient welfare.

Katie Cooney travelled to the Dublin protests from County Cavan and said the price of diesel is “unreal” and if there are no farms there is “no future”.

“Farms were impacted two weeks ago,” she said. “It was €550, now it’s up to €800 for fertiliser. Farms and contractors need support.

“I’m a student. My commute to college is going to cost 80-100 euro a week.”

Mark Maguire, a farmer from the Monaghan-Fermanagh border who has been part of the protests, told BBC Radio Ulster’s Good Morning Ulster programme that fuel costs are unsustainable for his sector.

He added that he wants the Irish government to stop taxing fuel.

Mark Hegarty helped organise a large protest in Bridgend, County Donegal on Thursday evening, where he said “hundreds and hundreds of lorries, tractors, vans and cars” blocked the road.

Hegarty told BBC Radio Foyle’s North West Today programme he felt compelled to take part in the demonstration after the government “threatened to bring the army in on” protesters in the Irish capital.

The slow-moving convoy was on the road for more than four hours, but Hegarty said that instead of holding the protest during rush hour, it started at 19:00 local time to minimise disruption.

Parts of the the M50 north and southbound are closed.

Transport Infrastructure Ireland has said road closures are “currently impacting Counties Clare, Limerick, Tipperary, Laois, Offaly, Kildare, Galway, Cork, and Dublin”.

Details of all closed roads traffic disruption across Ireland can be found on the TII website.

Dublin Airport passengers are being advised to allow extra time for their journeys a day after people were seen walking with their luggage along a motorway.

Delivery service DPD Ireland said it will temporarily suspend services in the Republic of Ireland on Saturday.

The conflict in the Middle East has caused rapid price rises for both petrol and diesel.

Some 20% of the world’s oil trade, the raw ingredient for producing both petrol and diesel, has been halted by the closure of the Strait of Hormuz.

Diesel in the Republic of Ireland has risen from about €1.70 (£1.48) a litre to €2.17 (£1.89) on many forecourts in recent weeks and petrol is now up to 25 cents more per litre at many pumps.

The protests started on Tuesday morning.