Police and fire crews are on the scene which is affecting a large part of a motorway in the Italian city.
There are also multiple cars on fire underneath the motorway where there is a Peugeot dealership.
Dramatic footage from the scene taken by a motorist driving towards the explosion shows a significant blast before he reverses away from the scene.
Local police said that there had been a collision on the motorway and an explosion happened in the subsequent fire.
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