A woman who was driving under the speed limit in the right lane of a busy highway has reached viral status after filming her rant when she was pulled over by police.

The woman, who Daily Mail Australia has chosen not to name, said it was 'absolutely disgusting' that she was pulled over for 'not going fast enough in a 90 zone'.

'There's absolutely no sign telling me I have to take over to drive in the right lane,' she said in a scathing video, threatening to 'expose and report' NSW Police.

She posted the rant on Facebook but later took it down after viewers pointed out the highway patrol officer was well within his rights to pull her over for the offence.

A woman who was driving under the speed limit in the right lane of a busy highway has posted a video threatening to 'expose' NSW Police after she was pulled over

According to road rules in NSW, drivers must keep left unless they want to overtake or turn right on all roads with a speed limit of more than 80km/h or with signage.

But the woman appeared to be unaware of the rule and continued to blast the officer, who was inspecting her license, for pulling her over.

'This police officer just pulled me over for apparently not going fast enough in a 90 zone and because its a taking over lane which there's no signs at all,' she said.

Panning her camera across the busy three-lane highway, she added that there were 'absolutely no signs' telling her she had to take over to drive in the right lane.

'Absolutely disgusting behaviour by police. I will have you all exposed and reported, pulling me over for no reason,' she captioned the video on Facebook.

Since posting the viral video online, the woman's personal Facebook page has been flooded with memes and inflammatory comments telling her to 'keep left'.