Drivers in Devon are being warned about icy roads on Tuesday as overnight temperatures drop to -5C in parts of the county.
The Met Office forecast a widespread frost and police said that although snowfall eased on Monday, driving could be dangerous on all but major roads.
Up to 8in (20cm) of snow fell in the worst affected areas on Monday.
Highways bosses and police said they were concerned snow, slush and rain could freeze, causing more problems.
Devon County Council said it was working continuously to grit 1,700 miles (2,735km) of main roads around the county on Monday evening into Tuesday.
The Highways Agency's fleet of gritters has also been out, treating 170 miles (273.5km) of the strategic road network in the county, including the A30 and the A38.
Snow closed the runway at Exeter Airport and caused cancellations to all of Monday's services.
The airport said it was anticipated that Tuesday morning's departures would operate as scheduled.
However, it added that there could be disruption to inbound flights due to adverse weather at other airports.
Heavy snow has cleared the South West, but the Met Office said there was still a risk of wintry showers.