Judge Collins said the victim would have been visible to the motorist for up to 4.5 seconds.
However, he said Ms Hotere significantly contributed to her own death by walking into the path of oncoming traffic.
"While the impact was not the sole cause of death, it was a substantial and operative factor," Judge Collins said.
Ms Hotere had lived in her Avondale home for around 50 years, residents said, and was well known to neighbours who would frequently see her making her way over to her card games.
"The car was coming out of the Z station and hit her at low speed," Inspector Tony Wakelin said at the time.
Salt was remanded on bail before sentencing in August.
The maximum penalty for careless driving causing death is three months in prison and/or a $4500 fine.
But his lawyer indicated she may make an application for a discharge without conviction at sentencing.