The man smashed into the woman, who then lost her balance, and fell into the busy Kirkeveien road, where she was hit by a bus. The woman was so badly injured that she died shortly afterwards from her injuries.
Police believe the rider, a keen cyclist who frequently took part in races, was travelling at such a high speed that the death constitutes manslaughter.
"My client is indescribably sorry for what happened and is extremely upset by it," Thomas Randby, the man's lawyer, told NRK.
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The trial began on Monday.