The M25 is closed in both directions in Hertfordshire because of a lorry fire and smoke blowing across the carriageway.
The section affects is between junction 21a for London Colney and junction 23 for South Mimms and the A1(M).
The Highways Agency says the road is expected to re-open from 3:00 pm.
More top news
The region has enjoyed its warmest day of the year and the hottest February day for five years.
A campaign has been launched to attract more American tourists to East Anglia by highlighting the region's links to the US military.
More than 13,000 primary school spaces are needed in Essex in the next two years.