The A14 between Bury St Edmunds and Newmarket was partially blocked after a vehicle caught fire.
Three Suffolk fire service crews were dispatched to the incident on the westbound carriageway near Kentford at 7.45pm.
Appliances from Bury St Edmunds and Newmarket stations were in attendance.
Suffolk police also confirmed officers were at the scene.
The conditions of motorists involved in the incident are not known at this time.
A 'stop' was called by the fire service at 8.40pm.
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