Motorists have been warned of difficult driving conditions due to fog.
The Met Office has released a yellow weather warning for parts of Bedfordshire, Buckinghamshire, Cambridgeshire, Hertfordshire and Northamptonshire.
People were advised that overnight fog was expected to persist until about 09:45 GMT.
Visibility could fall to less than 100m (328ft) in places, particularly in rural areas, the agency warned.
