The council's Long Term Plan said the signals were to primarily address safety issues for pedestrians and cyclists who were "poorly served" by the roundabout. It advocated a holistic approach to traffic and safety management.
"A number of crashes and near misses have been reported in recent years."
Councillor Gail McIntosh also highlighted the opposition from retailers: "Isn't that good enough?" she asked.
Councillor Bev Edlin said traffic lights were a step forward but she wondered how long the growing traffic volumes coming down Cameron Rd could continue to go through Greerton shops. What were the bypass alternatives?
Mr Parkes said people did not need to continue going through Greerton and along the length of Cameron Rd when they had the alternative of Route K.
He said converting the intersection to lights would also complete the missing link in Cameron Rd's cycleway. The missing link was between Greerton village's two Cameron Rd roundabouts.
In another roading decision, the council agreed to find a solution to pedestrian and traffic safety issues at the intersection of Maleme St and Cameron Rd.
Submitters to the 10-year plan said students were at risk.