Motorists are being warned of “treacherous” road conditions over the coming days.
A Met Eireann weather warning for low temperatures and ice is in place nationwide until Friday.
Temperatures will drop as low as -7C tonight, with severe frost, ice, freezing fog and wintry showers of hail, sleet and snow all forecast for the coming days.
READ MORE: New Ireland cold weather timeline as Met Eireann extends double warning in unusual move
The Road Safety Authority of Ireland has issued a warning to road users about the dangers posed by freezing fog.
A spokesperson said: “Combined with temperatures which are expected to drop below -5C, leading to a widespread severe frost, with a risk of icy roads, this poses a safety risk for road users.
“As visibility is reduced in such conditions a collision involving one vehicle can quickly involve many others, especially if driving too fast and too close to one another. The greatest risk is of a multiple-vehicle pile-up on roads with higher speeds such as motorways and dual carriageways.
“Dense fog reduces visibility greatly and makes driving very dangerous. However freezing fog, when liquid fog droplets freeze to surfaces, can make it difficult to keep the windscreen surface clear.”
The RSA recommends checking local and national weather forecasts before setting out on a journey. Drivers should clear windows and mirrors before setting out and carry a screen scraper and de-icer.
It has issued this advice on how to drive safely in freezing fog:
In patches of fog, switch on fog lights where visibility is reduced. As you enter fog, check your mirrors and slow down. Use your foot brake lightly so that your lights warn following drivers.
To prevent windscreen wipers from freezing and seizing up in freezing fog, add anti-freeze screen washer to the water tank. Check that the wipers for wear and tear and replace them if they are.
Do not drive on the tail-lights of the vehicle in front. This can give a false sense of security and you will be too close to be able to brake safely. In heavy fog, turn off your radio and let down your driver’s window a fraction, so as you can hear other traffic.
Remember to switch off your fog lights once the foggy conditions improve.
The RSA is also reminding road users of the dangers posed by ice and black ice:
If the road looks polished or glossy it could be black ice, one of winter's worst hazards: Black Ice is difficult to see. It is nearly transparent ice that often looks like a harmless puddle or is overlooked entirely. It can occur especially in sheltered / shaded areas on roads, under trees and adjacent to high walls.
In icy conditions manoeuvre gently, slow down and leave extra distance between you and the vehicle in front. Too much steering is bad and avoid harsh braking and acceleration. Use the highest gear possible to avoid wheel spin. Select a low gear when travelling downhill especially if through bends.
Watch out for vulnerable road users such as pedestrians, cyclists and motorcyclists and allow extra space when overtaking them.
Meanwhile, the RSA has advised pedestrians and cyclists to:
Avoid going out in dense fog / freezing fog unless it is a necessity. If absolutely necessary make sure you are clearly visible by carrying a torch and wearing reflective clothing. Stay well in off the road where there is no footpath when vehicles are approaching.
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