Diesel prices all over Ulster look set to rise above £1 per litre after a surge in crude oil prices saw the mark reached in Belfast.
Northern Ireland motorists have been enjoying lower fuel prices over the last few weeks.
According to independent road safety organisation, the IAM Motoring Trust, many parts of the UK have already seen prices "sneak" past £1, making it inevitable that the whole of Ulster will follow suit.
The price of Brent crude oil has risen to $$77 per barrel and low gasoline reserves in the US have also put pressure on fuel prices.
Nationally, unleaded prices fell an average of 1p to 95.2p per litre during September.
Diesel prices also fell very slightly by 0.1p to 96.9p per litre.
However, with winter setting in these prices are set to rise.
Kevin Delaney from the IAM Motoring Trust said that Northern Ireland had yet to experience the rise, but was certain the increased prices would " filter through".
He said: "People in different parts of the mainland have already seen diesel prices sneak past the £1 barrier.
"It is inevitable that prices in Northern Ireland will rise.
"The price of diesel generally goes up in the winter, while the price of petrol goes down.
"This is largely due to the US. Also crude oil is generally becoming more expensive."
Currently the average price for unleaded petrol in south Belfast is 98.4p and the price of diesel has already hit 100.2p per litre.
In east Belfast the average price of unleaded is 98.4p and diesel is 100.1p and in north Belfast the average price for unleaded is 98.5p and diesel 100.3p. West Belfast unleaded is 98.3p and diesel is 100.2p.
And while petrol prices are generally expected to be cheaper, Mr Delaney warned motorists should be braced for a rise.
Currently the UK has the sixth highest unleaded price in Europe and the second highest diesel price.
"It is quite possible that we could even see unleaded prices sneak over a pound," Mr Delaney explained.
"It will take a little longer than diesel, but it is quite possible. Governments tend to enter into panic buying if there is an impending war or political instability in a region.
"And this could lead to prices skyrocketing," he added.