A potentially fatal flaw in a $150 million road safety upgrade could be putting farmers and fellow motorists in danger.
Canegrowers Mackay has said the Walkerston Bypass Access project had an intersection that was "an accident waiting to happen".
Chairman Kevin Borg said the designs would force large cane farming vehicles to use a staggered T-intersection to traverse the Walkerston Bypass in both directions.
Mr Borg said an investigation by engineers on behalf of growers had found the road design failed to consider the increased volume of farm traffic at harvest season, from June to December.
"In the six-month crushing period alone, an estimated 220 trips per day, 22 vehicles per hour, will use the intersection to cross the bypass," Mr Borg said.