Oil spills are becoming an increasingly common danger on roads in the north west and Donegal County Council has launched a campaign to raise awareness of the problem.
Brian O Donnell, road safety officer with the council, says the danger increases in wet weather, like at present.
And he says diesel can take up to 100 days to break down so it can remain on roads for a long time, often reappearing only during rain.
Mr O Donnell has been telling Ocean FM News what are the main causes of oil spills on the roads.
