Aerial footage from M25 crash site
1 November 2013 Last updated at 14:25 GMT
Four people have been injured in a crash that closed the M25 in both directions between junctions 23 and 25, near Potters Bar, in Hertfordshire.
Police said one man was in a critical condition and another was being treated for serious injuries. No other vehicles were involved, police said.
Lorry driver Bruno Fernandes arrived shortly after the incident occurred.