The Met Office has issued an amber weather warning for ice.
Stretches of ice are expected to form on untreated road surfaces later this evening, and could persist into Saturday morning.
The Met Office is warning the public to avoid the risk of difficult driving conditions.
It said: "Road surface temperatures will fall widely below freezing on Friday evening and overnight into Saturday, leading to a risk of ice on untreated surfaces. This will be exacerbated by showers in places.
"A mixture of rain, sleet and wet snow is likely, with most of any settling snow taking place above about 200m. However, wet roads at low levels will contribute to the risk of ice formation."
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