The bridge carries a sign warning the maximum height clearance is 3.2 metres and loaded or empty Mr Leney has no problem.

Then last week for the first time Mr Leney drove his truck eastbound under the same bridge on the other, northern, side of the creek in Newport Road.

There is a similar warning also stating that 3.2 metres is the maximum clearance only this time Mr Leney did have a problem.

"The truck just suddenly ground to a standstill with loud crunching noises overhead," Mr Leney said.

"It scared the life out of me, I just wasn't expecting it. There was a lady in a four wheel drive behind me and she must have come darn close to running into me," he said.

The force of colliding with the bridge ripped the truck body roof open and snapped of the vertical stack exhaust pipe.

"I have measured the truck and it was less than three metres to the top of the exhaust pipe, the highest point which is about two inches higher than the roof of the truck but the sign clearly says the clearance is 3.2 metres so I should have had at least 200 millimetres or around seven inches of clearance.

"I reckon the road has been raised with roadworks and nobody has changed the sign. My boss will be looking for recompense for the damage to his truck, I reckon, but that apart it's obviously really dangerous to overstate the height clearance on a bridge like that," he said.

Railcorp is responsible for the signage.

"We will check the measurement and if it is wrong, change the sign immediately," a Railcorp spokesperson said.