Speed cameras on one bridge on the Princes Freeway to Geelong are Victoria's busiest cameras, issuing more than 100 fines a day on average for exceeding the limit or driving an unregistered vehicle.
Inbound and outbound cameras on the Forsyth Road Bridge at Hoppers Crossing snared more than 9700 motorists in three months; the Western Ring Road in Sunshine West was the next highest site with 4655 offences.
The busy freeway between Geelong and Melbourne is Victoria's key road for camera fines, with five of the top 10 fine hot spots.
The July-to-September 2013 camera-fine figures show the top locations for mobile speed cameras as the Nepean Highway in Frankston and Ormond Esplanade in Elwood.
The state government's camera-fine data shows changing patterns of motorists caught speeding.
In April to June last year the Burnley Tunnel was the No.1 speed-camera zone with 6309 motorists fined, and in July to September 2012, the top location was the Western Ring Road in Keilor East with 25,000 fines.
Melbourne has almost blanket speed-camera coverage of its freeways, with the exception of the Tullamarine Freeway.
Asked about the lack of cameras there, a police spokeswoman said decisions on where to place fixed cameras were made by a committee that included representatives from Victoria Police, the Department of Justice and VicRoads.
''It is important to note that speed cameras are just one way in which speed limits are enforced. Police will continue to run regular operations along the Tullamarine Freeway, targeting not only speed but other road safety issues, including dangerous driving and mobile phone use,'' she said.
On Thursday, Victoria Police launched the Operation Amity road safety blitz for the Australia Day long weekend, targeting speed, impairment, distraction, fatigue and seatbelt offences.
Police will target low-level speeding, with research showing 20 per cent of fatalities in 2003 and 2008 involved vehicles travelling up to 10km/h above the speed limit.
''This is a significant issue, we have shifted the culture when it relates to drink driving, now it is time for people to start thinking about how they are putting themselves at risk if they are going to actually speed,'' Assistant Commissioner Robert Hill, Road Policing Command, told 3AW.