A motorist charged with causing the death of a pedestrian by dangerous driving claimed the car had "a mind of its own".
Arthur MacVean, 63, is alleged to have driven more than twice the speed limit in Glasgow before colliding with a wall and hitting David Young.
MacVean claimed at the High Court in Glasgow on Monday that he used the footbrake, the handbrake and put the Vauxhall Vectra into neutral but could not slow it down.
The trial heard the car reached speeds of 65mph in Danes Drive, Scotstoun, on June 1, 2010. He said that as he approached the junction with Victoria Drive the car sped up.
He added: "It seemed to get faster. I remember the car going very, very fast. It seemed to gain speed quite dramatically. I looked down briefly to see if the accelerator was struck down by a floor mat, but it wasn't."
The court heard that MacVean, of Northland Drive, Glasgow, had been returning from a trip to the shops to buy honey and a packet of biscuits at 4.25pm when the crash involving the 26-year-old occurred.
MacVean was asked by defence QC Donald Fndlay: "Did you apply the foot brake?" he replied: "Yes. On a number of occasions. It wasn't slowing it down. It seemed as if the engine was over riding the brakes." He also told the court he applied the handbrake but that did not have any effect.
He said: "The car did not respond to what I wanted to do with it. I was attempting to analyse the problem and there was something wrong with the throttle and transmission. I was battling to control the car. It was a very dangerous situation I was in. My foot wasn't on the accelerator. My feet were on the clutch and brake.
"It seemed to be reacting as if it had a mind of its own. That's the impression I had. I thought the electronic throttle was jammed."
MacVean was asked by prosecutor Jamie Gilchrist QC if he had made up a story about there being something wrong with the car to explain what happened and he replied: "It's not something I would invent." Mr Gilchrist said: "Are you sure there was something wrong with the car?" MacVean replied: "Yes."
MacVean denies causing the death of Mr Young by driving dangerously at speeds in excess of 65mph.
The trial, before Lord Brailsford, continues.
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