The speed tolerance margin returns to 10km/h above the open road limit today after another drop in road deaths this summer.
In December, the margin was lowered to 4km/h as part of a summer road safety campaign but the national road policing manager Superintendent Carey Griffiths says there are no plans to introduce the lower threshold permanently.
"While it will take several months until a full and robust assessment of the campaign can be carried out, road safety agencies have been extremely heartened that most drivers seem to be taking the 'slow down' message on board," Mr Griffiths said.
The campaign has coincided with a decrease in the road toll. However, that has been tracking downwards for several years and police and other agencies say there are several factors, including safer vehicles and roads.
The lower threshold for December-January was the first time it had been trialled outside long weekends and public holidays. As of last night, the road toll since December 1 was 42 - nearly half of the 82 deaths recorded in December-January 2008/09, and down from 57 over the same period last year.