What causes fog and what does the fog car light symbol look like?

The Met Office has issued a yellow fog warning this morning (Picture: Getty)The Met Office has issued a yellow weather warning for large parts of the UK this morning, and has warned of disruption to travel.
The warning is in place until 11am on Tuesday, and affects parts of England, Northern Ireland and Scotland.
But what causes fog – and how can you spot the all-important button for the fog light in your car?Here’s all you need to know.
What is fog?
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