The family member, who did not wish to be named but spoke to the Herald in the hope of preventing another death, said improvements were needed.
She supported public suggestions that warning signs with words such as "crash zone" be installed to notify tourists as they left the Waitomo Caves tourist attraction.
"That intersection changed our lives. And we thought they were going to make some changes to that intersection ... to prevent something like that from happening again. That's awful."
Mrs Smith's family was still coming to terms with her death, which "didn't get any easier" as time went on. When asked how Mr Smith was coping, the family member replied: "We are all just getting through.
"It's awful and it's a very sad story and I wish that family well. They are going to have a lot of heartache coming up."
Meanwhile, the newlyweds' parents, Gary and Jean Stithem and Jim and Gerri Steinke, arrived from Denver, Colorado to New Zealand to be with their children, yesterday releasing a new photo of the couple from their wedding 11 days ago.
The New Zealand Transport Agency has committed to making further changes including a right turning lane at the intersection of State Highway 3 and Waitomo Caves Rd during summer and is considering improving signage options following public feedback.
MAP OF THE INTERSECTION: