Scotland's transport minister will make an emergency statement to parliament later on the snow chaos which brought gridlock to major roads on Monday.
Opposition MSPs have criticised Stewart Stevenson's response to the severe weather. Efforts are still continuing to reopen a 20-mile section of the M8.
Transport Scotland advised drivers in the central belt to make only "essential journeys".
Meanwhile, tens of thousands of pupils are having yet another day off school.
All schools in Glasgow, Inverclyde, East Dunbartonshire, West Dunbartonshire, North Lanarkshire, South Lanarkshire, East Renfrewshire and Renfrewshire will be shut.
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