A slight reduction in mean speed before the summer showed a big change in attitude, however more patience was needed, Mr Broderick said.
"People think if they drive 10km/h faster they'll arrive at their destination much faster - but they won't. If you're driving 10km/h faster for 10km you're only going to save a minute or minute and a half.
Drivers should not think of the speed limit as a target, he said. "In some conditions, you've got to go below it."
Nationally, the number of camera-issued speeding offences in December and January were more than double the same period any other year for the past five years, at 256,500 for $11,504,460.
Officer-issued speeding offences were similarly highest last summer at 62,254 for $5,783,930.
The road toll during the reduced speed period was 42, which was a 26 per cent reduction in road deaths compared with the same period the previous year. Twenty-three deaths in December was the lowest recorded for that month since records began in 1965, while 19 deaths in January was the second lowest for the month.
Police plans for tackling speed this summer would be announced later this month, national police spokesman Kevin Sinnott said.