Mr Cunningham's submission said the AA was concerned lowering the limits could actually increase safety risks because the organisation had observed drivers overtaking vehicles sticking to the 80km/h limits on the roads.
"Effective speed limits need to fit with human psychology and behaviour," he said.
"Frustrated drivers are more likely to make bad choices or take risks that could ultimately lead to worse safety outcomes on these roads."
But the officer in charge of Hawke's Bay's road policing group said in his submission to the council an accident on a stretch of road where the speed limit had recently been dropped to 80km/h would have resulted in two deaths if the limit had been kept at 100km/h.
Senior Sergeant Greg Brown said a July 31, smash at the intersection of SH2 and Pakipaki Rd, south of Hastings, where a truck pulled out in front of a car, would have been a double fatality if the car's driver had not been sticking to the 80km/h limit.
"Fortunately for the mother [driving the car] and her two children, she was travelling at the reduced speed limit.
"Although the collision was a heavy one, and the mother suffered serious abdominal injuries, the eight-year-old child in the front passenger's seat suffered moderate injury, and the toddler in the back was uninjured," Mr Brown said.
"Had they been travelling at the previous speed limit I have no doubt the mother and the eight-year-old would have died."
Mr Brown said the council should "put safety in front of minor inconvenience".