Speed cameras generated £7.5m from fines in Lancashire last year and reduced road accidents, according to new road figures.
The number of speed cameras increased last year
The number of people caught speeding in the county in 2002 had also increased sixfold on the previous year.
It follows the installation of 150 new cameras over the past 12 months.
Figures released by the Lancashire Partnership for Road Safety show that 127,000 people were caught breaking the speed limit last year - an increase of 600%.
Money generated from the fines will be used to fund additional cameras and road safety schemes.
The partnership said its figures showed the use of speed cameras had resulted in less fatalities and 265 fewer injuries.