Scotland's main commuter routes have been sent into chaos ahead of Wednesday's morning rush hour.
The Forth Road Bridge is closed in both directions until after the peak after an HGV was blown from the
northbound carriageway to the southbound side overnight.
The incident happened around 2am, leaving the crossing closed to traffic since the early hours.
The bridge operators said it was closed to high-sided vehicles at the time.
It's believed a man has been charged over the incident.
No one was hurt.
Traffic Scotland tweeted this morning that the crane required to lift the HGV can’t operate in high winds and that the bridge will remain closed until after the morning rush hour.
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Mark Arndt of Amey said: "The bridge is closed in both directions and we are doing everything we can to reopen the route as soon as possible.
"It's most likely that we'll be able to reopen one lane of the northbound carriageway later today, however we will need a crane to remove the HGV from the southbound carriageway, and this work is highly dependent on the prevailing wind speeds.
"We are continuing to monitor the forecast and have a team mobilised and ready to respond as soon as it is safe to do so, but it is very likely the bridge will remain closed through the morning peak.
"We know that closing the bridge has a serious impact on people's journeys and it's regretful that this situation has arisen."
The Erskine Bridge has been closed to high-sided vehicles until conditions improve.
And Dornoch Bridge on the A9 has also been shut.
Tricky driving conditions are expected on Wednesday as gusts of up to 75mph and wintry weather sweep across northern areas of the UK.
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Gale-force winds and blizzard-like conditions could bring travel chaos to some parts of the country.
Forecaster Craig Snell said the snow could lead to dangerous conditions on the roads and the strong winds could force bridge closures and cause lorry buffeting.
He said the winds would drop off during the afternoon but pick up again by Wednesday evening, leading to a combination of wind and snow.
The mix could bring "blizzard-like conditions across parts of Scotland" leading to "some very tricky driving conditions".
There is also a chance of thunder and lightning, which could disrupt the power supply and bring so-called "thundersnow".
Mr Snell added that it would be "a very unsettled and cold day across the northern half of the country".
Temperatures may drop to minus 5C (23F) in parts of Scotland, and freezing conditions are also possible in England.
The forecaster said it might feel mild in the morning across the country, but people would "notice the chill" when they headed home after work.
By Thursday, the stream of cold air will spread further south, bringing hazardous conditions to much of the UK.
Several yellow Be Aware warnings have been issued by the Met Office and the overall combination of wind and snow could lead to difficult travel conditions. There is also a risk of snow drifts on higher routes on Thursday and Friday.
Bear Scotland is promising more gritters on Scotland's trunk roads.
Ferry operators CalMac are expecting major disruption to services. Passengers should check before setting out on journeys.
The Scottish government's resilience team met on Tuesday afternoon to be updated on preparations.
Rod Dennis, of the RAC, said drivers should be prepared for "tricky driving conditions and significantly extended journey times".