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The footprint is a cost problem once. They don't need power, computers, or technicians to come out and maintain the equipment constantly.
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>The footprint is a cost problem once.

Land can approximately be converted to a recurring cost via rents.

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You forgot roundabouts with traffic lights.

Here’s one in Australia near Perth:

https://youtu.be/h8lhX9Q6Z5g?si=eloUWLcH8q3eJiZH

And I’m certain I’ve driven through other roundabouts with traffic lights in other states.

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In England we even have roundabouts of roundabouts https://en.wikipedia.org/wiki/Magic_Roundabout_(Swindon)
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I’ve driven around the Hemel Hempstead one a few times. Very confusing when I first saw the sign.
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Ooo! I like that one!
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I know of a couple in NSW: one in Albion Park, and another in Bomaderry.

They work well when the peak-hour traffic tends to block some of the entrances. You can use the lights to allow the blocked entrances to flow, then turn the lights off out of peak-hour.

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A roundabout can be as simple as a circle painted in the middle of an intersection, plus a bit of signage. It doesn’t have to be a big thing.
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