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Met Office issues a yellow fog warning for Hertfordshire
Drivers are being warned to be careful on the county's roads as fog reduces visability to 200m.
Large parts of south west Hertfordshire are expected to be shrouded in fog until 12pm today as the Met Office issues a yellow fog warning.
Disruption is likely on the roads during the morning rush hour, and drivers are being urged to be vigilant as fog is likely to be very dense in some areas.
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