GLENN Luke was behind the wheel of his B-double, travelling 70kmh, when he had to stamp hard on the brakes.
A bike rider had stumbled onto Gladstone Rd in peak hour traffic about 8am Friday, giving Glenn the shock of his life.
"He just walked across the road and didn't even look," Glenn said.
"I pumped the brakes and honked the horn."
The bike rider was dazed and confused after being attacked by a magpie on the other side of the road.
It was believed the rider hit his head when he came off his bike after the bird attack, and wandered across the road.
Glenn said he managed to stop his B-double just in time.
"He was just pushing the bike across the road and then I came to a stop; he looked up and saw everything and stumbled over," he said.
"I thought, surely he'd stop walking or start running across the road, so I slowed down, but he was just in a daze."
Glenn, a Brisbane-based truck driver, helped the cyclist to the roadside and waited with him until an ambulance arrived.
One witness, who was driving alongside the B-double, has commended Glenn for quick reactions in the emergency and for stopping so safely.
"He managed to keep the truck under control and no other vehicles were hit," the witness said.