Recovery is underway at the Copdock interchange after an accident left a lorry hanging off a bridge over the A14.
The lorry was travelling on the Copdock roundabout on the outskirts of Ipswich, heading towards Colchester.
Footage at the scene appears to show the lorry overturned, and partially overhanging the carriageway below.
The driver of the lorry has been taken to Ipswich Hospital to be treated for minor injuries.
A crane has now arrived at the scene to recover the vehicle as police put a rolling roadblock in place to clear the surrounding scene.
MORE: Everything we know about the lorry crash so far
It is a busy evening in the area, as thousands of fans head to Ipswich town centre for the Rod Stewart concert at Portman Road.
A spokesman for Suffolk police said: "A lorry has overturned on the Copdock roundabout.
"Part of the lorry is hanging over the bridge onto the carriageway, prompting safety fears. "Officers are en-route to the scene to close the road and keep drivers safe."
Another spokesman has since confirmed the A14 heading eastbound remains closed, and traffic is unable to get onto the A12 southbound from Ipswich.
He added: "We have handed over the scene to Highways England.
"There is a knock-on effect for traffic heading in all directions due to the disruption, and HGVs are prohibited from heading into Sproughton.
"Recovery is being arranged and this will be a long process."
Motorist Chris Punton said: "My partner Sam was the one that noticed it first, it was weird to see as we were trying to figure out how it happened.
"As we got closer we noticed the firefighters looking and talking about how they were going to rescue the driver who was still in there."
Passenger Roxy Louise Sier added: "The lorry is hanging over the edge precariously. Fire brigade, police and ambulance service are all at the scene.
"Firefighters retrieved the driver of the lorry through the drivers side window, who appears to be unharmed."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here