good thread a tangent: it is very hard to keep "ownership" of a 5 carlength gap ahead of one in traffic. "you're not using that!" is the ethic. And thus a safety margin is eroded so that some idiot can get 25 feet closer to his destination.https://twitter.com/drethelin/status/1120743461282512897 …
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Replying to @MorlockP
Tho most ppl can't articulate why, it actually is anti-social to maintain following distance. The flow rate in vehicles/time is inversely proportional to spacing if speed is held constant.
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Replying to @MorlockP
So you have 1k vehicles to get out of downtown on a road with a speed limit of 60mph. How long the road is doesn't matter because we are flow limited. At a vehicle spacing of one mile, the road can carry 60 cars/hour. At 0.005 mi, flow is 12,000 cars/hour.
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Replying to @robamacl
yep, agree with that. And if we stacked the cars bumper-to-bumper and accelerated smoothly bc it's all under computer control, we'd maximize throughput. but beyond a certain density, when actual humans are driving, average speed falls. 30% density @ 60mph > 50% density
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plus, we also care about latency, not pure throughput
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Platooning is a compromise between density and fault tolerance. https://en.m.wikipedia.org/wiki/Platoon_(automobile) …
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I think we both agree that automated driving can achieve much higher densities / throughputs, yes? Do we also both agree that throughput WITH HUMAN DRIVERS drops after a certain density?
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