Three lanes of the M25 have been closed after a coach crashed overnight.
A picture, from Surrey Police, showed a badly-smashed up coach at the side of the road with debris along its side.
The road is closed between junctions eight and nine anti-clockwise, Highways England said, predicting delays until 6.30am.
Surrey Fire and Rescue attended the scene but police said no-one was seriously injured.
Part of the M25 will be closed for the rest of the day after a lorry overturned, leaving on person in a critical condition while another is being treated for serious injuries.
The M25 is closed between J23 (St Albans Road) and J25 (Enfield). Congestion was reported earlier on the clockwise Clockwise to J22 with the A1081 (St Albans / London Colney) and on the anticlockwise section to J27 with the M11.
The emergency services are still on the scene but two air ambulances called to the scene have now left.
Motorists faced severe delays on the M25 after police were forced to close the Dartford Crossing in both directions due to a security alert.
Drivers were caught in nine-mile long tailbacks after both the QE2 Bridge and Dartford Tunnels were closed for almost seven hours during rush-hour traffic last night, as bomb disposal experts investigated a suspicious item.
Officers had been called to the crossing at 4pm following a report of a male pedestrian behaving unusually, Kent Police said.
He was arrested and remains in police custody.
Drivers at the Kent-Essex crossing are still facing delays despite the QE2 Crossing reopening, Kent Police have confirmed.
Kent Police has said the Dartford River Crossing remains closed while bomb disposal teams assess the situation:
Anna Stanford has posted on Twitter saying: "Glad I found myself next to Mr Whippy. 99s all round on the #M25 #dartfordcrossing"