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I think that if autonomous cars are ever widely adopted, the idea that they can also be a valet service will die pretty quickly. Imagine a typical Wal-Mart on a typical day. The vast majority of people park in an available space and walk to the store, then walk back out to their car. Now imagine if everyone were dropped off at the entrance. Now imagine if everyone summoned their car to the entrance as soon as they hit the checkout line. Now imagine both happening at once, all day, every day. The road in front of the entrance would be a nightmare. Now imagine that instead of the dropoff area being a private road with a large, adjacent lot, it's a public through street where the nearest parking is blocks away, and the cheapest parking is miles away. Imagine what an already busy downtown street would look like if 500 office workers all summoned their cars to pick them up at 5 after 5.
This is the kind of idea that sounds good when you assume the current traffic environment stays the same and you're the only one doing it. It changes greatly when everyone is doing it. If autonomous vehicles are ever widely adopted, I imagine there will be legislation prohibiting deadheading, with possible limited exceptions for people with disabilities.
Maybe I am missing something, but don't Airports already solve this problem? I feel like you could trade the 500 car parking structure for something like an arrivals/departures lane that could quickly and easily see 500 people into their cars and on their way. Apparently 60,000 people go through Dulles every day, and their arrivals area is four lanes for about a quarter of a mile (from eye-balling it).
From my experience, every major airport is a clusterfuck of traffic. Numbered lanes with numbered stops help, but every lane is still a disgusting snarl-up. Adding more lanes would require more space for splitting and merging, plus you need to provide a way to reach the furthest lanes.
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The impression I got from OP was that he was referring to the benefits of privately owned autonomous vehicles and not necessarily a subscription model. In that case, you can't just eliminate parking and replace it with a dropoff area. And while that may work for something like a Wal-Mart where there's a lot of space, I don't see how you'd implement it in an area like a downtown where the nearest parking structure could be a block or more away from the destination. A business district where I live has a four lane road running down the middle, and with disturbing frequency I'll be stuck in a traffic jam because an Uber driver making a pickup has effectively eliminated a travel lane. I can't imagine a situation where this becomes the usual mode of travel.
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