The RACT says it is more concerned about how many hours Tasmania Police is committing to speed enforcement than the number of fines it is issuing.
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Police have issued only 6158 speed camera fines since July compared with 22,531 fines during the same time last financial year.
RACT general manager of communication and marketing Vince Taskunas said infringement notices were only one method of deterring speeding motorists.
"The metrics we would be concerned about is the number of hours of enforcement and the spread of enforcement," Mr Taskunas said.
"The biggest deterrent effective against speeding, and the research has shown this, is people thinking that they are going to get caught."
Tasmania Police's latest performance report shows there have been 9082 roadside speed camera hours since July compared with 10,814 in the previous year to date.
But Assistant Police Commissioner Donna Adams said police were placing greater emphasis on high-visibility policing.
This has seen the number of high- visibility police cars increased from four to 18 while fluoro banding has been added to other vehicles.
There is also a higher proportion of marked to unmarked police cars on the road, she said.
Mr Taskunas said the RACT was concerned that budget cuts may have started to erode this approach.
"Our concern is there could be less of that type of policing but Tasmania Police has assured us that's not the case," he said.