Road user charges are in for a shake-up after an accidental Government U-turn. 

Owners of plug-in hybrids will pay $38 per thousand kilometres, a reduction from the planned $53. 

The Government accidentally supported a Labour amendment on the matter. 

AA spokesperson Terry Collins told Mike Hosking that the clean car discount was working last year so we'll have to wait and see what happens when it gets shut down. 

He suspects there'll be a pause in the market. 

LISTEN ABOVE 

• Minister Simeon Brown says 'balanced' road user charges are 'the right way to go'