It says that fog overnight and during Wednesday morning (January 12) is likely to cause some travel disruption.
And it has said to expect slower journey times with delays to bus and train services possible.
No hosepipe ban in Biggleswade area says Anglian Water
Changes to Schools for the Future programme will impact Shefford and Stotfold cluster and Aspley Guise
Biggleswade Dental Centre holds grand open day to celebrate new makeover
Pub in Biggleswade saved as plans to turn the listed building into a house are rejected
Man injured in light aircraft crash at Shuttleworth airfield
Fog patches are expected to form tonight, becoming dense and freezing in places by dawn on Wednesday - with visibility less than 100 metres at times.
The fog will thin slowly later Wednesday morning.