It was cool seeing it in action (I wonder who thought of it, and got passed the bureaucracy to make it happen). I wonder whether they considered industry standard truck height when building that tunnel.
Overheight vehicles are 4.3m and over in New South Wales, and this tunnel is signposted at 4.4m (and probably has a bit of leeway).
Trucker often have to deal with road limits: they are expected to know the size of their vehicle and pick an appropriate route. And if they don't, they are expected to read the signs along the route that indicate road limits ahead.
Cool enough that some exec is wondering how they can utilize it for future advertising. Looks like that water screen even had space in the corner for a "Glasses not working? 1-800-CONTACTS".