"It's time the council ... got the basics right," Jayde's aunt, Chanelle Hayes, said.
"I have no doubt if it was a councillor's family member this intersection would immediately be brought up to standard."
A council spokesman, who responded to the Otago Daily Times inquiries after more than two weeks, accepted the sign did not meet guidelines but said there were no plans to change it.
"These signs were compliant with the relevant regulations at the time they were installed, but regulations have since been updated," he said.
"When the standards for existing signs change, the DCC replaces them with new signs when the existing signs reach the end of their useful service life."
That "grandfathering" approach was similarly used with other ageing assets, such as handrails, guardrails and retaining walls, the spokesman said.
The driver of the ute in which Jayde was a passenger — who was 17 at the time — was cleared of dangerous driving causing death following a judge-alone trial.
Factors including the size of the signs and overgrown vegetation meant the teenage driver might not have known he was approaching an intersection, Judge Dominic Flatley said.