The robotaxis would have "basically nothing to do" in between morning and evening rush hour? Have you been to a major metro area recently? Have you looked at actual traffic data? You are greatly overstating the magnitude of daily demand fluctuation. In most cities, the nadir of midday demand is around 50-85% of the apex of evening rush hour demand. See graphs below for data from several cities from around the world. Also, Saturdays and Sundays exist as well, and they have much more even demand across the day.
Additionally, this data reflects the current reality for the transportation market in which vehicles move only when driven by a human. In a future of autonomous cars at low cost, the market will find productive uses for much the excess capacity, albeit probably at discounted off-peak prices. Economics has repeatedly shown that it's unwise to underestimate the creativity of free markets to find way to exploit resources. Most of those midday (and nighttime) uses will probably be for deliveries rather than passenger transportation.
By the way, 70-minute commutes like Everett to downtown are nowhere close to "about average" in the Seattle metro area. The average is 25-30 minutes, which is about the same as in most US big cities. A significant number of people are doing the reverse commute also, as I did last year. Also, I lived and worked in downtown Seattle for 2.5 years and I can assure you traffic did not drop to negligible levels at any point from 6am to 8pm.
Detroit, USA
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Adelaide, Australia
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Atlanta, USA
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Gaza, Palestine
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Borlänge, Sweden
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Amman, Jordan
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Talinn, Estonia
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I have looked extensively at traffic patterns. Extensively, it fascinated me. The people driving to and from metro stations, the people dropping kids off at schools, the landscapers, etc. I actually spent days looking and then decided it didn't matter. Most people that drove to work, park, then they don't move the cars. Most commuters, most days. That's well documented. So, the people on the road in the middle of the day are usually not commuters. Some are going to meetings but they are people doing something (fedex, delivery XYZ, service XYZ, kids, tourists, etc). Again it does not matter. Take Seattle again. 350k workers downtown. 25% commute in single use cars trips. 80k or so cars moving in and then leaving once a day. I use Seattle because my own metro region is so F'd it makes the numbers look worse for RT.
The RT picks someone up in suburbs and takes them downtown. Between 8- 9am the RT, 80K of them, are not parked but sitting in the roads causing even worse congestion. Where do they go? There are not 80k riders needing to go somewhere in downtown Seattle at 9am. Uber handles that 9am traffic in Seattle with a couple of thousand cars. That is the market downtown for people that didn't want to go around in a rental or in their own car. So you have a gap of 78k or so cars. That's a lot of traffic. A lot. Where is the business? It isn't there at 8-9 am. Cars are moving but it isn't 78k worth of cars moving. They are also not commuting regularly. People are working from home and a certain amount of that never comes back. That might help the RT use case I am just not sure. It means you have to have a huge amount of vehicles stashed to handle surges on Tues-Thursday.
If the commuters cars are the RT fleet then there are 80k chasing 2k worth of work. Does everybodys car get to take 2 fares/week? I don't see how that is even worth signing up in the system (the intercity midday fares in Uber are very low, 2-4 miles 10-15 mins- this is all about parking and convenience). An uber driver may get 15 such rides between rush hours. The pofitiable rides for Uber are bar hopping rides starting at 5pm and ending at 11pm but it's really not a big number. From 8pm to 6am there isn't much traffic except for this work and occasional airport work.
The greatest societal good I see from working RT is that it brings new societal interactions to elderly, handicapped, and substance abusers. Can they use an app? I guess we can make sure they are accessible. will the rt be handicapped accessible? Maybe Uber drivers will still be needed to move wheelchairs or ? Anyhow, lots of good but I am not sure how much profit.
Do your own analysis. Figure out how to move the commuters and then how to move the other people. Carve out all the people with work related vehicles. Go stand at a street corner and just count each car at a corner. Easy RT replacement or not.
Then here is another issue. We need to park and charge a minimum of 75k cars.
Will Tesla invest in 75k cars to handle Seattle transport market? If they had invested in 2018 they'd have needed 100k cars but people are teleworking so the number decreased across the USA. What would they have done with the extra 25k cars?
I think Waymo is on the right track. Gut Uber and grab all the dense Urban traffic and as demand slowly increases take the profits and expand. If Waymo is first you'll have 50k vehicles making profit. Waymo could be serving the 5 big CA cities by end of 2025 and that would be 5/20 in the USA. Obviously they add Austin and Phoenix and then some others. We'll see. They are being very methodical.
Google can better leverage the ad dollar spend associated with a captive ride, they'll know if you buy pizzas or pho on the way home and can hit you with ads or just to extend trip (OR NOT). For this reason I've always thought Google was in a good position. Also that Ubers data has some value.