Dubbo MP Troy Grant and Minister for Roads and Freight Duncan Gay have announced bull bars on light vehicles, within a reasonable tolerance of the requirements, will be given the two-year exemption.

"Minister Gay will issue a ministerial order to address the issue of non-compliant bull bars currently subject to a compliance campaign," Mr Grant said.

"This has been a real issue in the region and there is no simple solution. But we are working to make sure vehicles on our roads are safe.

"This exemption will provide vehicle owners who have inadvertently fitted a non-complying bull bar to their vehicle or are unsure about their bull bar compliance, with time to have their bull bar inspected by Roads and Maritime Services.

"Owners will be allowed to drive with their bull bar fitted during the exemption period.

"This exemption is about ensuring vehicle owners, who thought that they were doing the right thing, aren't disadvantaged."

But bull bars that grossly exceeded the current Australian Standards that were called up by NSW Regulations would not be exempt, Mr Gay said.

"This decision flows on from the NSW Vehicle Standards Working Group meeting last week," he said.

"Clear guidelines will be provided to relevant agencies about what bull bars are compliant, what bull bars will be exempt and what are clearly illegal.

"Any owners who are unsure or who have already received a defect notice for a bull bar they believe should be exempt, should then have their vehicle inspected at an RMS Authorised Unregistered Vehicle Inspection Station.

"The relevant agencies have been made aware of the ministerial order and will work to address outstanding infringement notices."