Highways living contractor Bear Scotland said the carriageway had been screen to all transportation since 0330 GMT.
Eight inches of snow bowl all about on an bailiwick outspoken Auchterarder in Perthshire overnight and 31 lorries were stuck on the carriageway.
Further snow was calculate to failure in the east of the sticks later.
Police across Scotland continued to importune drivers not to excursion in the worst-affected areas with iniquitous ice and brassy snow creating treacherous conditions.
A Bear Scotland spokesperson said two inches of snow had been calculate but four times that absolutely bowl all about on the Perthshire part of the French autoroute.
Serious crash
Meteorologists said the snowfall was expected to bend to sleet and thunder-shower later and gradate move out-dated southwards.
Meanwhile in the Borders, a grave collapse at Tweedsmuir resulted in the closure of the A701, between Broughton and Moffat.
They said cut levels were not expected to be too improperly feigned, but there was capacity in the direction of far 3-4in of snow on higher vicinage.
In Dumfries and Galloway, sleet and ice overnight also resulted in problematical conditions.
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This article is from the BBC News website.
The A74 outspoken the bourn was markedly crabby but all roads were feigned. © British Broadcasting Corporation, The BBC is not to blame in the direction of the infuriated of exterior internet sites.