Heavy snow and icy conditions left hundreds of drivers stranded in their cars on impassable roads for a second successive night on Tuesday.
The freezing weather left cars stuck across central Scotland on Monday and continued to cause problems on some of the country's busiest highways the following day.
And with temperatures plummeting to minus 20C, some cars and lorries were abandoned as gritters were unable to overcome the cold and make the roads passable.
Sudden heavy snowfall on Tuesday night left more than 100 vehicles stuck along one of the routes in North Yorkshire.
North-east Scotland, Northern Ireland and Yorkshire and Humber are expected to get more snow on Wednesday. Road conditions are likely to remain treacherous in several parts of the country.
Drivers in the worst-hit areas are being advised by Transport Scotland not to venture out unless absolutely necessary.
But forecasters say Britons do not have long to wait from some respite from the freezing conditions, with temperatures throughout the UK on Friday expected to be above zero for the whole day.
However, next week is likely to herald more wintry weather.
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