Motorists in New South Wales paid $408,000 a day in fines from speed and red light cameras during the past financial year, Government data has revealed.

The State Government collected just under $150 million in revenue from traffic fines in the 2013-14 financial year, according to official figures.

Data from the Office of State Revenue showed that May 2014 was the highest-generating month for fines from speed and red light cameras.

During that month, $18 million was collected from motorists - which equates to $580,000 a day.

The Eastern Distributor camera is the busiest in New South Wales, generating the most money, followed by the Pacific Highway at Ewingsdale, Botany Road at Rosebery and Cleveland Street at Moore Park.

Annual revenue from speed and red light cameras 2010-2011 $78 million

2010-2011 2011-2012 $107 million

2011-2012 2012-2013 $129 million

2012-2013 2013-2014 $149 million

The State Opposition said, in the past financial year, the NSW Government collected almost twice the amount of revenue from road cameras than Labor did in its last year of power, when $78 million was made in 2010-11.

The Labor Party lost the election in April 2011.

"No one supports speeding and I recognise the need for red light and speed cameras in fixed locations for safety reasons, especially in school zones, but I do not support their use for blatant revenue raising," said Labor's roads spokesman Walt Secord.

"Unfortunately, the State Government has built the foundation of its state budget on collecting fines. There is no other explanation for the explosion in revenue.

"In Opposition, the Liberals and Nationals promised to reduce the number of speed cameras, but in Government, they are seen as cash cows for Treasury."

Roads Minister Duncan Gay said his Government promised to turn off speed cameras that were not improving safety and it had done that, and all fines were going towards road safety.