Transport Minister Simon Bridges said he and the NZTA board had agreed to it because of the safety concerns aired.
"Road safety is a bottom line and it became apparent Police required more to fulfil what is necessary."
He said the extra funding was in addition to the $960 million allocation, but was still within the wider band estimated for road policing in the National Land Transport Fund.
The safety officers' jobs included roadside safety inspections, checking loads were secured, advising on the transport of dangerous goods and attending crashes involving commercial vehicles.
When he announced the proposal Superintendent Steve Greally, the National Manager of Road Policing, said the safety officers were not sworn staff and were largely specialist mechanics and engineers who had a more limited range of powers so could not easily be redeployed elsewhere in the police.
He said the sector and staff would be consulted before final decisions were made.
Last month Police Association head Chris Cahill said the proposal would leave nobody to police the safety of vehicles such as school buses and trucks, or to undertake assessments after crashes involving large commercial vehicles.
Road Transport Forum CEO Ken Shirley said it risked allowing operators to cut corners on safety to keep costs down while Road Transport Association general manager Dennis Robertson said it could mean more unsafe school buses and trucks on the road.
The NZ Transport Agency consults with Police when setting the Road Policing Programme every three years. The $960 million was six per cent more than the 2012-2015 budget of $890 million.