All traffic was held on the A1M near Peterborough this morning, Wednesday, after a lorry caught fire.
The motorway was closed at around 4:35am while emergency services extinguished the fire.
One lane was opened at 5:20am, but three lanes remained closed between junction 15 and junction 16 at Glatton to allow recovery work to continue.
A spokesperson for Highways England said: "We don't have an ETA for completion at the moment. Extensive clean-up and recovery work is on-going. Traffic is flowing quite well at the moment but we expect delays as we approach rush hour. If you can use an alternative route, might be best to use it."
The road was cleared at around 10.30am, although residual delays back to the A14 were reproted.