The Met Office has issued a warning for fog across Herefordshire and Monmouthshire tonight.
It comes into force at 5pm and is up until 11:59pm.
Although not all areas will be affected, some thick fog patches, with visibility less than 100 metres, are expected.
It could affect travel, with delays to bus and train services possible.
Revealed: The main roads in Herefordshire prioritised for repairs
Villagers fustrated over lack of road repairs
New Food and Drink group launched at online event