• Ice@lemmy.worldEnglish
    14·
    2 年前

    Looks to be an average of 2 ppl per lane with 3m ahead & behind. An average biking speed for commuters is 18-29kph, so let’s do the calculus for 20, 25, & 30. This gives a throughput of 2x3x(20 or 25 or 30)/(3.6x6) ≈ (5.5 or 7 or 8.3) ppl/second

    Car occupancy is ~1.5ppl/car in the EU. Given that this is a german highway Average distance between cars ~3 lengths meaning 4x4.5m=18m/car. For a long time these roads had “no speed limit”, but the recommendation was ~130kph. Let’s conservatively use 120 & 100kph. This gives 1.5x3x(100 or 120)/(3.6x18) ≈ (7 or 8.3) ppl/second.

    Various things fudge the numbers in either direction, but that’s actually shockingly close between the two.

    • arin@lemmy.worldEnglish
      8·
      2 年前

      You don’t enter or exit at 120kph so throughput is cut by the bottle neck of exiting/entering (also the reason why there’s traffic no matter the number of lanes, bottleneck is the throughput of entry exit creates the traffic stall

      • Ice@lemmy.worldEnglish
        3·
        2 年前

        Yeah I was trying to estimate the max throughput this highway has ever seen with cars, not the average. Nowadays they’ve even reduced the speed limit to a measly 80kph.

    • SwingingTheLamp@midwest.socialEnglish
      6·
      2 年前

      I gotta take issue with those numbers. A car moving at 130kph covers 18 meters in about half a second. According to the numbers I found online, experts estimate the perception-reaction time for braking at 1.5 seconds, which is up from the value of 0.75 seconds that they used to use. Thirteen and a half meters is an unrealistically-close following distance, even for German super-humans.

      I have not driven on the Autobahn, but the videos I can find show scenes much more consistent with a ~55 meter (1.5 seconds) gap between cars, or much-slower traffic speeds. That drops the estimated human-throughput way, way down.

      • Ice@lemmy.worldEnglish
        4·
        2 年前

        You assume people are driving safely - in my experience, during rush-hour at 90-100kph (Stockholm) someone will file in ahead of you if you leave more than 2 car lengths of space.

        Is it safe? No.

        Is it reality? Yes.

        Furthermore, this is an estimate of a feasible max throughput that may have occurred.

    • Dayroom7485@lemmy.worldEnglish
      5·
      2 年前

      Here is some data to get more accurate numbers:

      • max speed on that highway for cars is 80km/h
      • the bicycles had an average speed of ~18km/h
      • Ice@lemmy.worldEnglish
        3·
        2 年前

        The speed limit used to be higher though, originally it was nonexistent. Point was to estimate what the highest throughput of people in cars that highway has ever seen.

    • MonkderDritte@feddit.deEnglish
      5·
      2 年前

      Ok, but still healthier for all.

      And you can savely take half of car throughput on average. Or far less in congestion.

      • Ice@lemmy.worldEnglish
        4·
        2 年前

        Just a fun calculation, aiming at comparing the video to a reasonable max throughput of people in cars that may have ocurred, not the average :)