Freezing temperatures are continuing to lead to icy road conditions across much of Devon.
Temerpatures are due to drop to -6C overnight, and road surface temperatures are expected to be lower.
Devon County Council said gritters would be re-treating the road network, as thawing snow may have rinsed grit and salt away.
The South Western Ambulance Service said it had experienced a 30% increase in calls during the bad weather.
The control rooms at Exeter and St Leonards in Dorset have been dealing with 1,500 calls every 24 hours.
Chief Executive Ken Wenman said existing plans were in place to deal with the challenging circumstances resulting from the icy weather.
Councillor Stuart Hughes, from Devon County Council, said: "Drivers are asked to continue taking extra care.
"Pedestrians also need to be careful, as compacted snow on some footpaths has started to thaw but may quickly become icy tonight and into tomorrow."
There have been delays and queues at Exeter Airport, which reopened this morning after cancelling flights because of snow on the runway on Monday.
The Met Office said the night was forecast to be very cold with the chance of a few snow flurries and a widespread frost.