The M1 in Leicestershire is closed southbound between J21 (M69, Leicester) and J20 (Lutterworth) due to a collision.
National Highways said: "The M1 southbound is closed to provide a safe and sterile working environment for East Midlands Ambulance Service at the scene of a serious collision.
"Traffic was temporarily held on the northbound carriageway by National Highways Traffic Officers to allow The Air Ambulance Service to land directly at scene."
Diversion Routes
Southbound diverted traffic is also advised to follow the hollow square diversion symbol:
Exit the M1 southbound at Junction 21 and take the third exit (south/west) onto the M69.
Continue south/westbound on the M69 for approximately 14.5kms to M69 Junction1/A5 Interchange.
At M69 Junction 1 exit the motorway and take the first exit (left) onto the A5 southbound.
Continue along the A5 southbound for approximately 10.3kms to the A5/A4303 Cross in Hand Roundabout.
At the roundabout take the first exit (left) onto the A4303 eastbound.
Continue eastbound along the A4303 passing through the roundabouts at Magna Park and Coventry Road to the A5/A426
Lutterworth Road/Rugby Road Roundabout.
At the roundabout take the second exit (straight ahead) and continue eastbound along the A4303 to M1 Junction 20. Then rejoin the M1 southbound.