The Met Office has issued a severe weather warning in Gloucestershire for freezing fog.
The warning remains in place until 11am tomorrow with visibility reduced to below 100m in places.
Drivers are warned to take extra care on county roads as the freezing fog grips.
Temperatures are expected to plummet to -3 overnight with the Met Office saying visibility will be 'very poor' until tomorrow morning.
There is also a Met Office weather warning for heavy rain predicted for Friday morning with the possibility of localised flooding.