Google Street View shows them working in June 2018, but broken in October 2022.

https://www.google.com/maps/@-38.0140108,144.4659754,3a,37.7y,66.85h,82.98t/data=!3m7!1e1!3m5!1s6CGrfiIuto07AtX9hkIVNw!2e0!5s20180601T000000!7i13312!8i6656?entry=ttu

There also used to be another one on the Hume just west of Wodonga (Melbourne Bound only), and when I travelled past it back in October it didn’t seem to be working at all.

They were also on the Calder Freeway (Melbourne Bound) at the Bulla-Diggers Rest Rd Overpass in Diggers Rest, An Eastbound speed Checker on the Western Fwy at the same Ballan location, and another Westbound speed checker on the Western Fwy at the Gillies Street Nth overpass in Ballarat.

TBF, they had become increasingly redundant over the years with quite a lot of cars these days having built in (and thus probably more accurate) current speed displays alongside the existing speedometers, and the amount of standalone GPS systems that have a ‘your current speed’ in KM/H displayed as well.

The speed check units on freeways have all died over the years – there also used to be one on the Hume Freeway northbound at Beveridge, and westbound on the Western Freeway at Ballan.

The intersection of Kings Way and Sturt Street, South Melbourne is another trial camera site, but I don’t believe they have any enforcement cameras running there.

Here’s a closer view of a TIRTL unit mounted permanently in the kerb.

I think after the William Street camera, the one at Fitzroy Street and Lakeside Drive was very successful at revenue raising. I saw so many cars flashed there. So many 40 km/h signs but apparently no one could see them.