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Taken from;

http://www.austech.info/electronics/12070-...-melbourne.html

The camera is situated between Croydon Rd and Exeter Rd on Maroondah Hwy Croydon Nth heading east bound. There is a sign thats indicates speed camera in testing.

It could be the new sound camera, seeing as its at the bottom of a hill to catch loud trucks braking?

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https://www.sau.com.au/forums/topic/242025-new-speedsound-camera/
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I always thought the black rectangular holes were for a camera to watch the speed camera. They have been installing them for the last 3-4 years at speed camera sights that keep getting vandalised, if you notice they always have the speed camera in their sights. There is one in my area out the front of a technical college that also doubled as a seat to sit on whilst waiting for a lift (wasn't built into the ground like the one in your pics but has the rectangular cutouts), i heard a rumour that the police would do a drive by anytime someone was dangling their feet infront of it for a few minutes obscuring the view of the precious money maker that had a bad habit of getting its lense shot out or painted over or twisted a few degrees taking lovely scenery shots. Apparently..... I may as usual be very wrong but would love to know if anyone has more info, they have always had me stumped as to what they could possibly be for for years..

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