The camera, located on the M1 Princes Motorway at Gwynneville and focused on the northbound side of the road, finished in the top 10 for speeding infringements across the state.

In NSW there are 121 speed cameras (not including red-light speed cameras) in 98 locations across the state.

According to the latest Transport for NSW review of speed cameras, the M1 camera ranked No7 for infringements in 2017 with 7774.

The M1 camera finished higher than several based in Sydney.

Its high finish is all the more surprising given seven locations in the top 10 feature combined totals of two cameras.

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The camera sits on the motorway just after the speed limit drops from 90km/h to 80km/h and has long been the biggest money spinner of all the region's cameras.

It regularly rakes in more than $1 million in fines and, in the 2018-19 financial year it almost reached the $2 million mark with $1.93 million.

Perhaps unsurprisingly, the speed camera review recommended the northbound M1 camera - and its far less lucrative southbound companion - be retained.

The review found that there had been just four injuries caused by crashes in the vicinity of the camera in the five years to the end of 2017.

This compared to the 32 in the five years before the camera was installed in August 2003.

The southbound camera also saw injuries drop - from seven in the five years prior to installation to just two in the five-year period to 2017.

The review also recommended all speed and red-light cameras in the region should be retained.

Regional Transport and Roads Minister Paul Toole said the cameras weren't there to raise revenue.

"Speed cameras are in place to improve road safety, for all road users," Mr Toole said.

"That's why the revenue collected from them goes right back into the Community Road Safety Fund, to help fund other programs to save lives on our roads."