Fog could disrupt the morning commute for drivers, The Met Office has warned.
Forecasters have issued a yellow warning of fog for south west Hertfordshire today, which will be in force until 10am.
The chief forecaster at the Met Office said: "Light winds and clear skies overnight and during Thursday morning will allow fog to form in places. The fog will then slowly clear through the middle of the morning."
Fog patches are expected to becoming dense in places with visibility below 200 metres at times.
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