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My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

My programming language is better than yours Show more

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Federated Republic of Sean @freakazoid

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@clacke @cjd @freakazoid @dazinism PRT == automated guideway transit with small vehicles. The vehicles are summoned at stations, the guideways are closed to everything but those small vehicles. There’s been fully-automated PRT systems in service since the 1970s at least. Higher infrastructure cost to deploy, but it can be done with technology that demonstrably 100% works today.

β€œAutonomous vehicles” means autonomous cars on the roads, a much much much harder problem to solve, but using existing infrastructure.

@bhtooefr @cjd @freakazoid @dazinism Right, PRT implies rails or something close to rails. Is there any point to non-autonomous PRT today then?

@clacke @cjd @freakazoid @dazinism The β€œPRT vs. AV” debate being posed in this thread isn’t between a hypothetical β€œnon-autonomous PRT” and autonomous PRT, it’s between autonomous PRT and autonomous cars on roads.

@bhtooefr @cjd @clacke @dazinism I was thinking of PRT systems where the cars could be driven on roads as well, which solves the last mile problem. I can't find mention of such an option on the Wikipedia page, so maybe it wasn't as common a proposal as I'd thought. That's why I was thinking about the combination of the two technologies.

...

@dazinism @clacke @cjd @bhtooefr PRT seems like it could potentially deliver on the failed promise of monorails: cheap elevated guideways. Monorails are big and you can't walk on the guideways, so being able to evacuate means you need a lot of ladders or walkways along the side, so the infrastructure is not much cheaper. With PRT you could potentially climb over or around the cars and walk on the guideway, just like on an elevated freeway.

@bhtooefr @cjd @clacke @dazinism That means you can have a guideway that's barely larger than a pair of cars and space the emergency ladders/stairs farther apart, assuming elevated guideways, which I think is usually what you want.

Though there is a huge advantage to sharing infrastructure even with dedicated lanes, since you can just expand as you cut into normal car travel.

@dazinism @clacke @cjd @bhtooefr (There are also structural reasons monorail tracks are expensive, and the vehicles are more expensive. So the only real advantage is noise because they run on pneumatic tires, but there are lots of different guideway and vehicle configurations that can use pneumatic tires.)

@freakazoid
I spent a good few years working modifying vehicles to run on biofuels & trying to encourage decentralised biofuel production. Became very aware of transport issues, alternatives, energy requirements & thought about it all a lot

Its not hard to imagine better systems but theres a number of massive & influential industries (roads/oil/auto/finance) tightly tied to the existing model. This heavily influences the political will to push for alternatives

@clacke @cjd @bhtooefr

@freakazoid

I attended government consultation events packed with representatives from the established industries, pushing heavily for their interests

I think the finance around autos is very important. After a mortgage its the biggest debt many folks have (although college/uni debt has also become huge)

The implications of changing from this amount of personal debt would be huge

The transport inefficiency in our societies is huge. People travel long distances to…

@clacke @cjd @bhtooefr

@freakazoid

…another town (sometimes even country) to do a job, someone else from that town does the same the other way. Same with goods. Its all daft. You'd think that economic efficiency would stop stuff like this, but it doesnt, its common

@clacke @cjd @bhtooefr

@dazinism @freakazoid @clacke @bhtooefr
I seem to recall someone saying that nobody thinks about skype as a green technology, but the possibility for telecommuting which it created has had a massive impact on energy consumption. People still need handshake and eye-contact, it's part of trust and collaboration, but this doesn't necessarily have to be every single day.

@cjd @bhtooefr @clacke @dazinism Zoom, Slack, email, Jira, and Confluence reduce my commuting by 20%. I'm planning to work only remotely after this job; I have a standing offer for a job where the office is much farther away but I could work from home most days and on days I went in my drive would only be a few miles because I could take light rail to the train.

@dazinism @bhtooefr @cjd @clacke Low interest subsidizes the capital cost of cars to an extent. Long commutes are an effective wage reduction. I think they don't go away because voters (i.e. the people who actually vote, donate, and campaign for politicians) won't allow them to. By which I mean they don't allow the construction of new housing or mass transit.

@clacke @cjd @bhtooefr @dazinism As for goods going long distances, that's subsidized by exchange rates, fixed international postage rates, the governments of export-dependent countries, and the US government through stupid tax laws (which I think 45 may have fixed?). Also ships don't have to pay motor vehicle fuel taxes (or many other kinds of taxes AIUI). Not sure about international cargo planes.

@dazinism @bhtooefr @cjd @clacke I think this is why a carbon tax is ideal. It lets us shift things gradually and "naturally", and we'll naturally start with the lowest hanging fruit, which is probably the truck fleet and other fleet vehicles, because the infrastructure is more centralized and biodiesel can run in unmodified engines.

@freakazoid @bhtooefr @clacke @dazinism
My personal opinion is that we need a new "interface" which is neither butt-on-seat nor rubber-on-pavement. Some interface between a transport pod which carries passengers or cargo and the car/train/boat/mag-lev/hyperloop which carries it, then a sort of router which switches pods on and off of different transport. This would change the economics of running (for ex) a train line, because it can directly pull commuters off of a road.

@cjd @dazinism @clacke @bhtooefr We already have such an interface, and it's cheap as hell. It's called a cargo container. There is also some kind of system that allows attaching those to trailers, but I don't know how standardized it is given that I see trailers loaded directly on flatbed train cars a lot.

@freakazoid @bhtooefr @clacke @dazinism
Now it just needs to be fast enough and safe enough that people will sit inside of them while they're being transported.

@bhtooefr @clacke @dazinism @cjd It is probably possible to design a fully-automated loading and unloading system that could load cars onto special "sleds". The main drawbacks would be that you're unnecessarily transporting the car's power plant and undercarriage, and the sleds and loading system would be expensive compared to just driving a special car onto a guideway.

@cjd @dazinism @clacke @bhtooefr Actually, now that I think of it, adding hardware to current electric cars to let them run autonomously and receive power from a guideway would be damn cheap. Just a lowerable doodad underneath with a pair of brushes and an interface to a bus that signals over the power lines. Linking the cars together could be optional, but that linkage could provide redundancy in case of gunk on the guideway conductors.

@bhtooefr @clacke @dazinism @cjd Alternatively you just have two doodads (trolleys?) that connect to the center guide.

You'd probably want the guide to be T-shaped to make it hard to touch both sides if someone needs to walk on the guideway. Unlike the "third rail" or overhead line in an AC system, I think HVDC is safe if you only touch either conductor, since neither would be grounded.

@cjd @dazinism @clacke @bhtooefr Rather than using cameras or sensors on each car, the guideway could use cameras all along it. No radar is necessary, and the processors could be local and connected in a daisy-chain fashion with wireless long-range links to bridge any failed wired connections or control units. You'd have 3 control units per cell, maybe just by overlapping them with the next and previous.

@freakazoid @dazinism @clacke @bhtooefr
The idea would be to split the part with the passengers, HVAC, stereo, etc from the part with the powerplant, wheels, etc. Of course it's carrying more than you have to carry if everybody's on a bus, but my opinion is if your transportation network can't be used to transport an ambulence, it's not complete.