Schools are unopen and immoderate roads are blocked aft dense snowfall fell successful parts of Cornwall.
More than 80 schools are closed oregon opening late and drivers person been urged to instrumentality other care.
Devon and Cornwall Police said the A30 and A39 adjacent Carland Cross, adjacent Truro, were some blocked, with reports of cars and lorries stuck successful the snow.
A yellowish informing for snowfall for Cornwall and parts of westbound Devon, and crystal successful each of Devon, is successful spot until 10:00 GMT.
Erica, from Four Lanes, adjacent Pool, told BBC Radio Cornwall snowfall started successful the country astatine astir 01:00 GMT and near cars trapped aft "they were covered successful snowfall successful astir an hour".
BBC Radio Cornwall's Emma Clements said St Dennis had experienced "probably astir 10cm [4ins]".
She said from 1 of the village's greens "which is rather adjacent the main roadworthy betwixt Newquay and St Austell, which runs close done the village" it had started becoming slushy by astir 08:00.
Cornwall Fire and Rescue Service tweeted it had received reports of vehicles getting stuck connected the A39 astatine Trispen and the A391 astatine Bugle amid "hazardous" driving conditions.
It said: "If necessary, propulsion implicit if it is unsafe to continue."
Police tweeted that highways unit were alert of problems caused by snow.
"Please let other clip for immoderate travel and thrust with care," the unit said.
The Met Office informing said radical should expect rain, sleet and snow, followed by clearing skies starring to icy stretches and immoderate disruption to travel.
Cornwall Council said it had deployed gritters connected main routes, but determination was inactive the imaginable for crystal connected roads.
Devon County Council said its gritters had been retired overnight, treating much than 2,000 miles (3,220km) of the county's main routes.
About 14 miles (23km) of rhythm routes astir Exeter person besides been treated.
Devon's unpaid snowfall wardens person besides been advised to beryllium prepared to dainty precedence routes successful their section communities this week.
No schools successful Devon person been closed, but immoderate schoolhouse routes are not operating, the county assembly said connected its website.
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