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Joined 8 months ago
Cake day: April 10th, 2025
  • sp3ctr4l@lemmy.dbzer0.comtoData is Beautiful@lemmy.world•Passenger deaths per 1 billion passenger miles (2000-2009)English
    17·
    12 days ago

    Go go gadget spitball math!

    Sources for average transit mode speed

    Source 1:

    https://www.gigacalculator.com/articles/what-is-the-average-speed-of-different-modes-of-transportation/

    These are the average speeds of some common modes of transportation:

    Commercial passenger aircraft: 547 to 575 miles per hour
Private jet: 400 to 711 miles per hour
Europe high-speed rail: 155 to 217 miles per hour
Shinkansen (Japanese bullet trains): 150 to 200 miles per hour
Modern cruise ship: 23 to 27 miles per hour
Bicycle: 10 to 24 miles per hour
Sailboat: 4.5 to 7 miles per hour
Walking: 3 miles per hour

    Source 2:

    https://www.researchgate.net/figure/Average-travel-speeds-in-each-survey-year-and-standardized-mode-speed_tbl1_338604360

    Source 3:

    https://wonderlearning.blog/real-average-speed-us-train-facts

    When people think of passenger trains, they often envision swift, efficient travel. However, the operational reality for Amtrak, the primary passenger rail operator in the United States, is far more nuanced. While its locomotives are capable of impressive speeds, the average journey speed for most passengers is surprisingly modest, often hovering between 50 and 60 miles per hour, with long-distance routes averaging even less.

    Ok, I’m USAsian, gonna be US-centric, and I’m gonna make some spitball roundings for easier math:

    Average Actual Travel Speed:

    Motorcycle: 50 mph

    Car: 50 mph

    Ferry: 25 mph

    Train: 50 mph (long/medium distance)

    Bus: 25 mph

    Subway/Lightrail: 25 mph

    Aircraft: 550 mph

    Attempt at Conveying Math Proof

    So we have:

    D = deaths per billion miles. S = speed in miles per hour.

    If we first solve for and find the time taken to travel one billion miles at speed S, we would do:

    T = 1,000,000,000​ / S

    (T is time in hours)

    What we want is D / T

    D / T = D / ( 1,000,000,000 / S)

    ->

    D / T = (D * S) / 1,000,000,000

    So, that’s our rough conversion.

    Using (D * S) / 1,000,000,000 , the OP graph becomes:

    Deaths per hour of transit, by transit mode, for every billion miles travelled:

    Motorcycles: 10,628.5

    Car: 364

    Ferry: 79.25

    Train: 21.5

    Subway/Lightrail: 6

    Bus: 2.75

    Aircraft: 38.5

    So… thats basically deaths per billion hours spent using said transit mode.

    Notes

    You may have noticed that Aircraft are now more dangerous than Buses, Subways, med/long distance Trains, and are only ~2x safer than Ferries, not ~45x times safer, as they are with the OP metric.

    One hour of Motorcycles transit, on the other hand, is now ~29x more deadly than an hour of car transit, ~276x more deadly than an hour of aircraft transit…

    … as opposed to the OP metric, where a billion miles of motorcycle travel is again ~29x more deadly than a billion miles of car travel, but is ~3039x more deadly than a billion miles of aircraft travel.

    tl;dr:

    Basically, take travel speed into account, and aircraft become significantly more deadly per hour spent travelling in them, but the ratios between terrestrial and aquatic craft stay pretty similar, due to no one having yet proposed the ikranoplan as a mass transit solution.

    (Historically minded readers may note the absence from these numbers of the ‘revolutionary’ hyperloop, as well as monorail, due to basically not fucking existing in real life.)

    You may quibble about the actual average speeds of various transit modes as you please.

    More Notes

    Probably also worth noting that this is only deaths, not injuries, say, requiring hospitalization.

    I imagine doing deaths + serious injuries would also change this graph significantly.

    Also also, this doesn’t take into account road rage that does not directly involve the vehicle, I don’t think.

    It does not include injuries or deaths on some form of public or mass transit where say, you get assaulted by another passenger, or something like that.

    That could also tweak things, potentially, but I have no strong instinct about if it would really matter, or how… and, you could again do deaths vs deaths + serious injuries.

  • sp3ctr4l@lemmy.dbzer0.comtoTechnology@lemmy.world•Bluesky has started honoring takedown requests from Turkish governmentEnglish
    1·
    8 months ago

    Assuming you are serious:

    Bluesky is … arguably ‘federated’, but it is centralized, not decentralized.

    https://gigazine.net/gsc_news/en/20241128-bluesky-decentralization

    Their model (AT Protocol) relies on a central, authoritative … ‘Relay’, that all ‘federated’ users and posts on federated PDS (personal data servers) must go through, to actually reach the ‘AppView’, ie, what all other people/users can actually see.

    So, this is not a many to many, tangled spider web of connections, the way lemmy, and other parts of the actual fediverse are.

    It is a top down hierarchy, a pyramid.

    And Bluesky runs the Relay, the chokepoint.

    If Bluesky cuts off the PDS your account is on, everyone on it is now gone.

    The actual fediverse, Mastadon, Lemmy, etc, runs on ActivityPub.

    In that model… every instance is essentially self contained, and every instance that is federated communicates with every other instance that is federated.

    Each instance can decide what other instances they want to federate with… and users on each instance can personally block even more other users, communities, or entire instances if they choose to, but that only effects what that particular user sees.

    That is what you call decentralized, approaching, or also having elements of being ‘distributed’.

    To bring up an example without getting into the drama that led to it:

    The ‘Tankie Triad’ of ml, lemmygrad and hexbear have had a number of other instances defederate from them.

    But, there are also a good number of instances that have not done so.

    So that means if your account is on hexbear… you can’t see or post on an instamce that has blocked your instance.

    But, if you (a hexbear…ian?), post on a neutral instance… users on that neutral instance will see the post.

    But but, if a user from an instance that has defederated from hexbear goes to to the neutral instance… they will not see the hexbearian’s post.

    This sounds complicated, and it is, but … thats the whole point of a decentralized system. It is more complex in the abstract… but the entire system ends up being more robust, more adaptable, more customizable… without a central authority in direct control of the entire system.