A $60,000 police commission report failed to conclusively say whether photo radar slows down Edmonton drivers.

But commission chairman Brian Gibson says it provides evidence that people do put the brakes on.

"A reliable and statistically robust evaluation of Edmonton's photo radar program was not possible due to the manner in which the program was deployed and the associated data limitation," said the 89-page Photo Enforcement Traffic Safety Study, presented to the commission last night.

The study's authors, University of British Columbia engineering professors Paul de Leur and Tarek Sayed, said they had nothing to compare with the data collected after photo radar was introduced in Edmonton.

They said the city began using photo radar in 1993 at a few locations. Since then the program has grown to six cameras used at "many" locations.

"The lack of a clearly defined start time for the implementation of the program makes a before-after evaluation difficult," said the report.

Nonetheless, by reviewing reports about the effectiveness of photo radar from other cities in North America and Europe, the authors determined it is "generally effective in reducing vehicle speed at sites where photo radar was deployed. In some studies, it is suggested that the reduction in speed caused by photo radar deployment should translate into a reduction in the frequency and/or severity of collisions."

The findings were enough for commission chairman Brian Gibson.

"It shows it is an effective tool to reduce speeds as well as reduce the incidents of speeding," said Gibson, adding fines are a deterrent and photo radar is not a source of revenue for the city.

"If you break the law you get a ticket."

A second report, about whether the city should continue contracting out for photo radar equipment or run it on its own, is due in 90 days, said Gibson.