An elderly woman fatally struck by a concrete truck as she crossed the road on Sydney's lower north shore on Thursday was about to celebrate her 61st wedding anniversary this week.

Gangotri Maharaj, 83, was walking hand-in-hand with her husband, Vijay, across Willoughby Road at Crows Nest about 11am, when she was hit by the truck travelling north at Albany Street.

The couple's daughter Gita Singh told Ten News that her mother and father were only in the suburb to attend prepolling for the upcoming federal election - their first time since recently becoming Australian citizens.

In a statement she released on Thursday afternoon, Ms Singh said the family were "devastated" by the tragedy, just minutes after they voted.