Workers on board a bin lorry which crashed in Glasgow killing six people would not have had enough time to stop it, an inquiry has heard.
Crewmen Matthew Telford and Henry Toal only had around five seconds to react when the council vehicle started deviating from the road, collision expert Mark Hill said.
The tragedy took just 19 seconds to unfold three days before Christmas last year.
Mr Hill's calculations showed the vehicle was travelling at 25.9mph when it mounted the pavement.
His report said the crew were "physically obstructed" from reaching driver Harry Clarke, who appeared to be unconscious at the wheel.
He said it may have been possible for them to pull the handbrake before the lorry crashed into a hotel but it could have made it lose control in another direction.
Erin McQuade, her grandparents Jack and Lorraine Sweeney, Stephenie Tait, Jacqueline Morton and Gillian Ewing died in the crash.
The inquiry, which is expected to last six weeks, continues at Glasgow Sheriff Court.
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The driver of a bin lorry which crashed killing six people had collapsed at the wheel before, an inquiry has heard.
Harry Clarke lost control of the council truck in Glasgow city centre on December 22 after apparently losing consciousness.
But the hearing was told he had previously blacked out while driving a bus in April 2010.
John Stewart, an inspector with First Bus Glasgow, was called out to deal with the incident.
His notes show said the driver "advised he'd taken unwell at (bus) stop and blacked out for a couple of minutes".
They went back to the depot and paramedics were called after the driver reported feeling unwell again. After being checked out and given the all-clear Mr Clarke refused to go to hospital.
The inquiry, which is expected to last six weeks, continues at Glasgow Sheriff Court tomorrow.
A bin man has told an inquiry that he was "terrified" when the truck he was travelling in veered out of control and knocked down people in a packed Glasgow street.
Henry Toal, 47, gave evidence on the second day of the inquiry into the tragedy which killed six people just before Christmas last year.
Mr Toal said he saw his colleague Mr Clarke slumped to one side, his hands still on the steering wheel.
He told the inquiry at Glasgow Sheriff Court: "I was wondering what was going to happen, where we were going to end up."
Mr Toal, who suffered an eye injury when the truck finally crashed in to the Millennium Hotel in George Square, added that he was afraid the vehicle would go up in flames.
The Glasgow bin lorry inquiry has adjourned for the day and will continue tomorrow.
A second passenger in the Glasgow bin lorry that crashed into a crowd of pedestrians has said he had no training in what to do if someone was ill in the truck.
Henry Toal told an inquiry he "would not know what to do" if a work colleague was unwell.
Earlier, fellow passenger Matthew Telford said he was never trained in what to do if a driver fell unconscious.
Henry Clarke was described as being "slumped at the wheel" of the vehicle before it mounted the pavement in the crash.
Mr Toal says he has not had any training regards what to do if someone took unwell at work, in the truck #binlorry
A bin lorry reached speeds of up to 40mph as it careered into pedestrians in Glasgow city centre last December, an inquiry has heard.
Waste collector Matthew Telford, who was in the backseat of the lorry when it crashed, told the hearing the truck was initially travelling at around 10mph before accelerating.
ITV News Scotland Correspondent Debi Edward said Mr Telford explained how the truck went "fast then slow and then fast again" during the incident in which six pedestrians were killed.
A dustman repeatedly punched the driver of a bin lorry in the back as he careered into pedestrians in Glasgow City Centre last December and told him "you've started killing people Harry", an inquiry has heard.
Matthew Telford, who has worked as a waste collector for Glasgow City Council for 17 years, was in the backseat of the lorry when it crashed.
The 46-year-old, who was crying as he recalled the events, said he thought Harry Clarke was "having a laugh" when he slumped at his wheel.
ITV News Scotland Correspondent Debi Edward is in court listening to Mr Telford's harrowing account:
Mr Telford said "what are you doing Harry?" as the driver Harry Clarke slumped to the left #binlorry
He repeated that, and for a brief moment thought Harry Clarke was having a laugh. Then Harry slumped further - only held up by his seatbelt
Mr Telford remembers hitting the pavement and then the bin and he saw them hit 3 women. He said "you've started killing people Harry"
A video showing the moment a bin lorry crashed in Glasgow, killing six people, has been shown at an inquiry into the accident.
ITV News Scotland Correspondent Debi Edward said the video was "too awful" to describe, but revealed how many bystanders rushed to help those hit.
Video was too awful a scene to describe but you could see just how many people ran to help those struck #binlorry
The families of those killed left the court for the showing of the video, our correspondent adds.