'Blind spot' could have prevented Sydney bus driver from seeing mother and baby, inquest told

An inquest into the death of a Sydney woman who died saving her baby daughter from being run over by a bus has heard the collision could have resulted from a so-called "moving blind spot".

Mi Jin Shin was carrying her 11-month-old daughter when she was struck by a bus as she was crossing Hannah Street in Beecroft in May 2012.

The 38-year-old was knocked to the ground and the bus drove over her.

Her baby daughter Meera survived the crash because Ms Shin pushed her away from the wheels of the bus.

An inquest into Ms Shin's death has heard she was crossing the road at the same time as the bus turned left into Hannah Street.

Senior Constable Wayne Stevenson from the Metropolitan Crash Investigation Unit told the inquest he believed Ms Shin was walking about the same speed as the coach and that the driver failed to see her because she was obstructed by the vehicle's windscreen pillar.

"The blind spot on the A-pillar of the bus played a big role," he said.

He added that the slope of the road and Ms Shin's short stature would have made it even harder for the driver to see her.

Senior Constable Stevenson also told the inquest that the intersection was a known "black spot".

"There seems to be a lot of motor collisions there, not fatal ones, but serious ones," he said.

Sam Agostino witnessed the collision and was one of the first people to help Ms Shin when she was injured.

He told the inquest he saw the bus clip Ms Shin and "pull her under".

Mr Agostino broke down in tears and had to take several deep breaths as he described how he jumped out of his car and started banging on the side of the bus get the driver to stop.

"The lady was getting rolled under the bus," he told the inquiry.

"I looked to the right and there was a baby on the ground.

"I picked up the baby and it was screaming."

Mr Agostino told the inquest the driver then got out of the bus and tried to resuscitate Ms Shin.

"He was doing the best he could to do something ... CPR," he said.

A second witness, Edmond Esho, also broke down as he described the collision to the inquest.

"They both happened together," he said.

"The bus was rolling and I thought the woman wasn't looking at the bus.

"It was a devil's moment where two calamities combined."

The inquest continues.