Police have closed a section of the A1(M) southbound in Hertfordshire after a serious collision near Welwyn Garden City.
The emergency services are at the scene, and traffic is being diverted between junction six for Welwyn, and junction four for Hatfield. The incident is causing severe congestion, and fire crews are asking drivers to avoid the area.
The Highways Agency advises those heading from the north down to London use the A14 eastbound and the M11 southbound instead.
One lane blocked southbound between Luton Airport (J10) and Redbourn (J9) due to a broken down lorry. Congestion to Flitwick (J12).
Investigations are continuing after a coach and a lorry crashed on the A1 in Cambridgeshire.
It happened on the northbound carriageway near Buckden at about 5.30 yesterday morning.
Ambulance, police and fire crews were called to the scene. Thirteen people were taken to hospital - two of them with serious injuries. All were released yesterday.
The remaining passengers went to a temporary rest centre before continuing their journey from London to Newcastle. The northbound carriageway was blocked for most of the day.
15 minute delays on the Norwich - London Liverpool Street line due to a signalling fault near Manningtree in Essex.
The M1 is blocked northbound between junction 8 and junction 9 (Redbourn). It is reported that a lorry has overturned, and is blocking all four northbound lanes.
Closed in both directions at Hastingwood after an accident between the M11 (J7/Harlow) and Rayley Lane (North Weald Roundabout).
The A10 Cambridge Road is blocked southbound due to an accident involving two vehicles between Stretham and Chittering.
A car has overturned on the M11 northbound exit slip road at Cambridge (J11 - Cambridge South / Harston).
One lane is closed northbound due to a broken down vehicle between J12 (Flitwick) and J13 (Bedford / Milton Keynes South).
The A505 is closed in both directions between Lilley and Hitchin due to resurfacing work.
This is the main road between Luton and Hitchin. It will be closed until 8pm this evening. Traffic is being diverted.