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Harrow said..Ian K said..No jokes in Adelaide.
The O-bahn allows buses to go 80kph mostly unimpeded by commuters who must use motor cars.

This looks more expensive to build than a road....and there are still drivers. What's the idea, why not just have a dedicated bus road if that is what you want??
First section went in in the eighties from NE running in (Salisbury- i think) poor road infra-structure grid-lock rush-hour - this was gold for the commute. From memory went down "green corridor!!" . very popular.. probably still is. The driver is hands-off - it has feeler wheels for steering. thats probably why the car stuffed it. So journey starts on road does pick-up circuit then hot-foots it down bus-track no stops till other end then joins bus Rd network again at other end.
I used to use the Glenelg tram which is to SW side, but after living in Melbourne the trams coming in to inner suburbs like Richmond were always an awkward mix with rush hour traffic - in the middle of the road - stopping level with the tramstop and having to cross one lane of traffic which should always stop.. they were making mini-stepoff islands in places... I liked using them though.
The network of wires around junctions for trams - numbing maintenance - quiet often the pick-up jumped the cable and bang - all-stop whilst driver / conductor lined the bits up again..- v.Victorian (era not state!!) The current trend is to have batteries and get rid of the wires around complex zones - built in charging network over the rest of it.
Car free cities mean higher density living - not obvious in OZ, but CBD zones should be a goer... Certainly Melbourne has a few, and Brisbane is getting semi-serious - but only likely to drop the speed limit to 40 KPH for time being.
Although slow compared to bus even in rush hour I really enjoy the City-Cats - but there is no moving the river!!
Cheers
AP