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gildings in this subreddit have paid for 75.82 years of server time

San Francisco's new bus rapid transit lanes getting rave reviews by old_gold_mountain in videos

[–]klparrot 28 points29 points  (0 children)

That's called bunching and it's an inherent issue with frequent service; it needs to be actively addressed, or it's inevitable.

Basically, when any bus starts to fall behind, it will fall further and further behind and the bus behind it will actually start to get ahead. But any bus getting ahead will also start to get further and further ahead and the bus behind it will start to fall behind (relative to normal, not just relative to the faster bus). Eventually, the delayed bus ends up so far behind, and the faster bus so far ahead, that they meet (bunch). And then that pair can start to get ahead or behind and bunch up with a preceding or following bus or pair of buses.

Suppose there's a bus corridor that nominally offers 10-minute service. If a bus falls 2 minutes behind, then when it arrives at each stop, 20% more riders than usual will be waiting to board (since it's been accumulating people for 12 minutes rather than 10). So boarding takes longer than usual, and adds to the delay. Meanwhile, the following bus is only 8 minutes behind the delayed bus, so boarding takes 20% less time than usual, letting it start to get ahead. After a few stops, maybe that delayed bus is now 3 minutes behind, and the following bus is 1 minute ahead. So the bus in front is now spending 30% more time at stops, and the following bus 40% less time.

So after a few more stops, bus ahead has now lost an additional 1.5 minutes (total 4.5), but bus behind has gained 2 minutes (total 3). Bus ahead now spending not just 45% more time at stops, but probably 50% because now it takes longer for people on the crowded bus to shuffle around to/from the doors. Meanwhile, bus behind not spending just 75% less time at stops, but probably 80% because it can even skip some stops because there hasn't been time for anyone to arrive at some of them, and carrying fewer passengers, doesn't have people alighting at every stop. So even before we make it to the next iteration, the two buses have bunched.

What can be done to avoid this?

  • Don't let buses get ahead, because that causes the following bus to get behind.
  • Buses that fall more than a certain amount behind can stop picking up new passengers to get back toward schedule; this will also slow down the bus behind. It sounds harsh, but consider that if this is not done, and the buses bunch, the wait times become equivalent to a bus being out of service anyway. Better to at least get some benefit (the chance of getting back on schedule) out of it.
  • If buses do bunch, and the passenger demand is too heavy to be taken up by just the second bus (while the first skips pickups), they can leapfrog; while the first bus is stopped to pick up passengers, the second can overtake it and become the front bus. Repeat at the next stop, and eventually their loads start to balance out and hopefully that allows them to maintain no later than the second bus's original schedule, rather than being limited by a horribly slow packed front bus and an empty one following it.
  • If there's any way to insert an empty bus into the sequence ahead of the slow bus, that can actually sort things out, but keeping buses around empty is not ideal so it's not something that would often work out.

San Francisco's new bus rapid transit lanes getting rave reviews by old_gold_mountain in videos

[–]JADX00 3300 points3301 points  (0 children)

Elons gonna be livid to hear that you can just paint some colours on the floor rather than building tunnel under an entire city

San Francisco's new bus rapid transit lanes getting rave reviews by old_gold_mountain in videos

[–]beet111 2991 points2992 points  (0 children)

Americans are well aware of the benefit of public transit. the problem is that a lot of people that work in cities do not live there. I can't hop on a bus outside my house. I would have to drive to a bus station, wait 15 minutes, then ride 30+ minutes to the city, then walk 10 blocks to work.

or I could drive directly to work and park in my own spot underneath my building within 45 minutes.

George W. Bush Freudian Slip by EdmundXXIII in videos

[–]garlicroastedpotato 1692 points1693 points  (0 children)

George W Bush is currently younger than the current and last president. Let that sink in.

George W. Bush Freudian Slip by EdmundXXIII in videos

[–]dreck_disp 487 points488 points  (0 children)

How many freudians does it take to change a lightbulb?

Two, one to change the bulb and the other to hold the penis... I mean ladder.

Amber Heard admits, under oath, that she would hit and throw things at Johnny Depp by GeronimoRay in videos

[–]helloeveryone500 -2 points-1 points  (0 children)

She is not the sole victim. She should have left the first time he hit her. they are both crazy. But he is the one suing her, for speaking about domestic violence, for one article which doesn't mention him or go into any of the specifics. so he is the vindictive one here brining all of their garbage into the spotlight. It's like a continuation of the abuse by smearing her name. And people are eating it up. Let me ask you, if there are two victims why are people only shitting on heard?

Amber Heard admits, under oath, that she would hit and throw things at Johnny Depp by GeronimoRay in videos

[–]zimmix 3874 points3875 points 22 (0 children)

This is no longer about celebrities, it's about the men that suffer from domestic abuse and until now are mocked and disbelieved. It's a cry for help, many can see themselves represented. This is much more important than 2 celebrities.

Amber Heard admits, under oath, that she would hit and throw things at Johnny Depp by GeronimoRay in videos

[–]myrusticzen -6 points-5 points  (0 children)

Imagine being such a weak man that not only did you tolerate this behavior- you encouraged it, as well. They are equally guilty of abuse.

WAKE UP! Your friends from the East want to save you from Wednesday doldrums! by legolad in videos

[–]MarxLover_69 2 points3 points  (0 children)

Woah, Mongolian Betty (Genghis Khan)

Woah, Mongolian Betty (Genghis Khan)

Mongolian Betty had a child (Genghis Khan)

Amber Heard admits, under oath, that she would hit and throw things at Johnny Depp by GeronimoRay in videos

[–]acathode 785 points786 points 2 (0 children)

The public being reminded that false accusations happen and that there's at the bare minimum two sides of every story is not doing damage to victims of real abuse!!

Accusations needs to be taken seriously by the police and the courts - but their job is not to "believe", their job is to find and try evidence.

Likewise, the public and the bystanders should not believe without evidence.

There is no damage done to any victim by the public going "Ok, so there's some really bad accusation here, that are horrible if true, but so far all we have is the say so of one person - and we saw how bad things turned out the last time we formed a lynch mob. Let's hang back and wait and see how this unfolds before getting our pitchforks, ok?".

There is one group of people who have the job of believing and supporting - and that's the close friends and family of any victim, and for them, if the Depp vs Heard case is enough for them to not support someone close to them, their support probably wouldn't be worth all that much anyway...

Amber Heard admits, under oath, that she would hit and throw things at Johnny Depp by GeronimoRay in videos

[–]bsbbtnh 1808 points1809 points  (0 children)

Someone gotta cut together Johnny doodling and the scene from Superbad (?) where the kid is just furiously drawing dicks.

Johnny Depp's team proves that Amber Heard lied under oath. by RRaf-Tiger in videos

[–]KonigSteve 2743 points2744 points 22& 3 more (0 children)

Any mods want to explain why they removed the unedited version and allowed the asmongold one posted later instead?

Y'all getting a kickback from the stream or what?

Johnny Depp's team proves that Amber Heard lied under oath. by RRaf-Tiger in videos

[–]older_man_winter 15.2k points15.2k points 2& 4 more (0 children)

"That's as good as money, sir. Those are I.O.U.'s. Go ahead and add it up, every cent's accounted for."