It has been revealed the truck and excavator which shredded 60 metres of asbestos tiles from the ceiling of the Acton Tunnel cleared the eastbound side of the tunnel first.
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But it is still not known where the truck and its load, which shut down westbound traffic on Parkes Way for more than 50 hours after Tuesday's smash, had travelled from and whether it was properly secured.
A spokesman for Charman Earthmoving and Heavy Haulage, John Kananghinis said, the tunnel sloped on one side, which is why the truck did not have any issues on the first pass.
"[The truck] went in one direction and then the other. The tunnels are different heights on both sides of the road, they're not equivalent heights. It's entirely possible for a truck to clear one side and not the other," Mr Kananghinis said
He confirmed the driver was still employed by the company and it was still participating in WorkSafe ACT's investigation but warned it could be a "matter of months" before findings were released.
"One hopes it would be faster than that but it's a detailed, slow process. The important thing is no one was hurt but investigation procedures are just as meticulous whether there was an injury or not," Mr Kananghinis said.
Last week the company denied a permit was required to carry the excavator.
"What we can say clearly is these loads when operated correctly do not require a special permit," Mr Kananghinis said.
The ACT government is lodging an insurance claim to recoup some of the costs incurred by the crash and the ensuing traffic diversions and clean-up operation.