A yellow weather warning has been issued for Norfolk.
The alert, by the Met Office, covers the entire county and East Anglia.
It was issued at around 11pm last night and warns for high levels of fog.
The warning is in place until 10am today.
A spokesman for the Met Office said: "Fog, dense in places, is likely to bring some travel delays.
"People should expect slower journey times with delays to bus and train services possible.
"There is a chance of delays or cancellations to flights.
"Give yourself the best chance of avoiding delays by checking road conditions if driving, leaving extra journey time, or amending plans if necessary."
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