Motorists are being advised to take extra care when driving on the Letterkenny to Ramelton Road.
It follows at oil-spill over a long stretch of the road.
Gardai say the road is very slippy in places and have advised motorists to drive slowly.
Stephen Maguire
Stephen Maguire is the co-founder of Donegal Daily. He has worked as a reporter for almost 30 years starting locally with the Donegal Peoples Press before moving to the Mirror Group. He continues to contribute daily to national media outlets including the Irish Times, RTE, the Irish Independent, Irish Sun, Irish Mirror, Irish Star, the Daily Mail and the Examiner.