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Patches of fog could cause difficult driving conditions in rural areas, the Met Office has warned.
The weather service has issued a yellow warning for the county, as well as Slough, West Berkshire and Greater London.
Patches of fog are likely to form in rural areas during Wednesday evening, becoming more widespread and dense overnight and on Thursday morning.
The warning says that low visibility could lead to extended journey times and "difficult" driving conditions in places.
Visibility could be as low as 50-100 metres in places.
The warning is valid until tomorrow morning at 10am.
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