On Wednesday snow caused some roads to close and motorists to be stationary for “long periods of time” in Devon and Cornwall, according to authorities there.
Gritters working into Thursday morning have been fitted with ploughs to clear routes in the area.
Car insurer RAC said it has seen the highest levels of demand for rescues in a three-day period since December 2022.
“Cold conditions will last until at least the weekend, so we urge drivers to remain vigilant of the risks posed by ice and, in some locations, snow,” said RAC breakdown spokeswoman Alice Simpson.
National Rail have also advised passengers to check before they travel, as ice and snow can mean speed restrictions and line closures.
On Wednesday evening, poor weather was affecting Northern and Great Western Railway.
Buses are also replacing trains between Llandudno Junction and Blaenau Ffestiniog until Monday.
