this post was submitted on 14 Jun 2026
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Showerthoughts

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A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The most popular seem to be lighthearted clever little truths, hidden in daily life.

Here are some examples to inspire your own showerthoughts:

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So self driving car brands are currently in the process of offering subscription based self driving features.

Soon these subscriptions will be cheap enough for everybody to abandon public transport and get into their self driving cars instead.

This means that everybody will be in their cars and it will create the biggest traffic jam in human history!

And finally, self-driving cars will be totally safe and able to drive completely unsupervised! While standing still in traffic going an average of 5 km/h...

It will be beautiful (/s)

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[–] daniskarma@lemmy.dbzer0.com 5 points 6 hours ago (3 children)

The best commute transport is the one you don't have to use.

Remote work is the solution.

[–] Colonel_Panic_@eviltoast.org 1 points 11 minutes ago

It's a win-win.

Office/computer/phone type jobs get to stay home, satisfaction and productivity goes up.

In person jobs now have far less cars on the roads every day, rush hour isn't as much of a problem anymore, less time and $ wasted stuck in traffic.

[–] Allero@lemmy.today 2 points 1 hour ago

Remote work is amazing, and honestly office jobs should move to that.

But then there's plenty of jobs that require you to be present in person and do things in the physical world.

[–] AloneDownUnder@quokk.au 3 points 4 hours ago (1 children)

Sure, remote work is nice. But there are plenty of reasons to go outside and travel around for other reasons. Holidays, trips, visiting friends, retirement.

[–] daniskarma@lemmy.dbzer0.com 1 points 3 hours ago

I think if the number of travels is nor al big (once or twice a week) it's not a problem people using cars.

The big problem is when every single person use the car minimum of twice a day, all at roughly the same hours and going to the same places. Plus all the other leisure travel.

Just cutting out work commute would solve a lot of problems and a big chunk of energy consumption and pollution emissions.

[–] Apytele@sh.itjust.works 7 points 11 hours ago (1 children)

This was an episode of doctor who.

[–] AloneDownUnder@quokk.au 2 points 4 hours ago

I actually saw this one. Pretty funny. For those who want to check it, it's apparently Episode 3 from Series 3: 181 – "Gridlock"

[–] Munkisquisher@lemmy.nz 29 points 15 hours ago (2 children)

This is a much talked about risk in urban planning, where empty cars going slowly around inner suburbs will be cheaper than parking costs. The "zero occupant problem"

Congestion pricing, taxes based off mileage or driving time and providing depots on the edge of cities are ways to combat this

[–] FriendOfDeSoto@startrek.website 15 points 15 hours ago

The "zero occupant problem"

The fact that this has a name is such an indictment of failures in urban planning. I'm going to assume an American coined the term because a lot of other places have not fought the idea of public transport as much as the American automobile industry.

[–] AloneDownUnder@quokk.au 4 points 15 hours ago (1 children)

That would make sense actually. How would congestion pricing work though? Like you have to pay for the duration you occupy the road? How to track this?

[–] Munkisquisher@lemmy.nz 2 points 6 hours ago (1 children)

It's only really trackable with a gross amount of surveillance, either gps based inside the car or cameras on every street

[–] AloneDownUnder@quokk.au 1 points 4 hours ago

I suppose they could do something like the toll roads, where you drive through a coil and trigger a wireless badge. Everytime you trigger it you will pay a certain fee. If you don't have a badge, your license plate is recorded and you get sent a fine. Similar to speed cameras you already have.

[–] Rhynoplaz@lemmy.world 8 points 15 hours ago (2 children)

But if ALL the cars auto drive, and can communicate with each other, it would probably become more efficient and faster than human traffic.

[–] SwingingTheLamp@piefed.zip 18 points 14 hours ago (1 children)

Not Just Bikes did a video about this exact topic, and how it would turn our cities into dystopian hellscapes. Because we'd have to ban everything except the intetconnected cars from the streets.

[–] Triumph@fedia.io 32 points 14 hours ago (1 children)

Wait, hear me out.

We make only a few streets for self driving cars only. We could even actively prevent other traffic by fitting the cars with special wheels that fit on special tracks. And to optimize space, we connect the cars together.

[–] StenSaksTapir@feddit.dk 9 points 9 hours ago* (last edited 9 hours ago)

We could put those roads underground in tunnels so there'll be no interference from other traffic. And then they could go on rails too and maybe make the car bigger so they can fit more people.

[–] AloneDownUnder@quokk.au 4 points 14 hours ago

In that case you would have to ban human-driven cars from the roads no?

[–] FriendOfDeSoto@startrek.website 3 points 15 hours ago (3 children)

There is an argument that a connected Borg collective of self driving cars would be capable of running vehicles with smaller gaps in between them, thus reducing congestion and improving efficiency in traffic.

[–] grue@lemmy.world 9 points 12 hours ago* (last edited 12 hours ago) (1 children)

Hi, traffic engineer here.

That's never going to happen. It's nothing but a tech-bro bullshit fantasy.

Why? Because cyclists and pedestrians exist. In order to make it possible for the kinds of gains you're talking about to happen, every road user has to be an autonomous vehicle, but (aside from freeways) streets simply do not work that way and never will.

(Oh, and also: even at the limit, the best it can ever accomplish is to be an inferior approximation of a train.)

[–] AloneDownUnder@quokk.au 1 points 4 hours ago (1 children)

I suppose self-driving cars could drive like regular cars on the small roads, but then go to big specialized highways where they can go full speed.

But that doesn't make sense anyway, because that would not save you that much time anymore. And in that case you could just have regular cars to drive to a station with parking and then take the train to your destination

[–] grue@lemmy.world 2 points 4 hours ago

We already have those big specialized highways; that's what freeways are. The trouble is, even if autonomous driving were capable of doubling the lane capacity (and IIRC the theoretical best case is actually less than that, closer to a 50% improvement), induced demand is still a thing. It maybe buys you a reprieve for a decade or so, but after that you're right back to "just one more lane, bro!"

[–] AloneDownUnder@quokk.au 9 points 14 hours ago (1 children)

But at what point would it just be better to just have a self-driving bus, or even put a railway instead?

[–] rockerface@lemmy.cafe 16 points 14 hours ago

At every point. Public transport is more efficient at transporting people than private cars will ever be. If we have enough of it, it's not even going to be crammed during rush hours.

[–] Nurse_Robot@lemmy.world -5 points 14 hours ago (2 children)

If all cars were driven with good autonomous features (we're a long way off) there would be no traffic. Traffic is solely due to human error

[–] grue@lemmy.world 5 points 12 hours ago* (last edited 11 hours ago) (1 children)

No, that's not how traffic works. That's like saying a pipe can flow an infinite amount of fluid when you used a liquid instead of a gas because you got rid of the empty space between particles.

Even with theoretically-perfect timing and control, the road still has a finite capacity because cars take up a certain amount of space, both stationary and moving (following distance is still a thing even with computer control because of the mechanical limitations of brake performance). Moreover, it isn't that much higher than we can manage with humans driving the vehicles already.

The only ways to exceed that limit are to make the vehicles smaller (e.g. bikes) or pack more people into them (e.g. buses or trains).

[–] Nurse_Robot@lemmy.world 1 points 11 hours ago (1 children)

Traffic is massively impacted by people breaking after ending up too close to another vehicle. There are great demonstration videos in the late 90s / early 2000s demonstrating this. I don't anticipate me stating this fact to gain any support, because, you know, Lemmy says AI bad no matter what.

[–] grue@lemmy.world 3 points 9 hours ago* (last edited 9 hours ago)

You're right: when traffic is at its critical density, that's often what triggers the shift from the free-flow regime to the congested regime. But just because you make computers drive the cars -- even assuming they did it perfectly without randomly braking, which they don't -- that doesn't mean it eliminates that flipping between regimes. At best, it might get you a little bit more capacity before hitting that critical threshold, but eventually it's still going to, and then something -- a squirrel darting into the road, a sunbeam glinting off something the wrong way and momentarily confusing the AI, a bump that disturbs the car just enough to make it slow down a fraction of a MPH, etc. -- is going to trigger that shift to the congested regime anyway.

[–] SteveGoob@lemmy.world 4 points 11 hours ago (1 children)

This is simply not true on its face.

Unlike the thought expirement you're running in your head, the real world does not have the luxury of avoiding the possibilities of sudden mechanical failure, a soccer ball being kicked into the road, or unsecured debris falling out of the bed of a truck. These are privately owned and maintained vehicles after all, under many more engineering constraints and usage pressures than just achieving maximum reliablilty in all conditions.

These things require some degree of margin for error. In general, any car should be able to fully stop before entering the space currently occupied by the car in front of it in order to account for unexpected disturbances. However, as car speeds increase, so do the tolerances required to maintain that safe margin, exponentially in fact.

Removing the human from the driver seat doesn't mean we get to start running bumper to bumper at 70mph; at best it means that cars can get away with slightly smaller follow distances than humans need to account for their comparably slow reaction times.

If you instead believe that we should exert enough control over self driving cars such that we could actually realistically prevent catastrophe while running high speed bumper to bumper traffic, then I have great news for you! We already have that, and it's called a train.

[–] Nurse_Robot@lemmy.world 0 points 11 hours ago* (last edited 11 hours ago) (1 children)

It's not a thought experiment in my head. It's a highly studied and demonstrated fact. And it doesn't require bumper to bumper cars, it requires cars consistently traveling with safe breaking distance, something humans didn't do.

[–] SteveGoob@lemmy.world 1 points 6 hours ago* (last edited 6 hours ago)

I don't refute that. I agree that far too many humans are far too comfortable with unsafe following distances.That's not the claim you made though:

Traffic is solely due to human error

And as I said, it's just simply not true. Congestion happens because car traffic does not scale or recover from disturbances efficiently. Human behavior exacerbates this, sure, but cars are just fundamentally bad at moving people when a road is at capacity. Chalking traffic it up to "human error" alone misses the forest for the trees.

[–] SwingingTheLamp@piefed.zip 2 points 14 hours ago (1 children)

This, but unironically. Self-driving cars will completely ruin driving, maybe permanently?

[–] AloneDownUnder@quokk.au 1 points 4 hours ago

I hope not.. Even now I already feel like I want to move to a place where everything is reachable by foot or bike. But with these property prices, that's basically a faraway dream...