The M6 near Lancaster is now fully re-open after a two-lorry crash that left queues of motorists sweltering in 80 degree heat.
A man was taken to hospital with minor injuries after two HGVs collided between Junction 33 and 34 on Thursday afternoon.
A mixture of diesel fuel and cement from the wagons spilled across the motorway causing a section of road to be closed for 16 hours.
Traffic was gridlocked near Lancaster during rush hour as a clean-up and road resurfacing operation took place.
Motorists and passengers suffered in the baking sun as they queued to leave the M6 at Junction 34.
A woman was taken to the Royal Lancaster Infirmary with breathing difficulties after a 999 call from the motorway at 4pm.
Motorists, police and Highways Agency staff handed out drinks to people stuck in the queuing traffic.
The crash happened at around 3.40pm on Thursday.
A spokesman for North West Ambulance said the injured man was complaining of soreness and an injured shoulder, was put onto a spinal board as a precaution and taken to the Royal Lancaster Infirmary.
Another man declined treatment at the scene but drove himself to hospital to be checked over.
All lanes were reopened by 8.10am on Friday.