Police are advising drivers to avoid the M25 until mid-afternoon after a lorry fire closed the carriageway on both directions in Hertfordshire.
The section between junctions 21a and 23 near the South Mimms services is expected to be closed until 3pm.
Long tailbacks have built up on surrounding roads.
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It will be dry with variable cloud, although fog patches could be possible later.
Perhaps a few bright spells, but generally rather cloudy with some showery rain possible at times, especially in the afternoon.