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Hard-braking events as indicators of road segment crash risk

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Re: Hard-braking events as indicators of road segment crash risk

#441

Post by lazide »

direwolf20 wrote: post #433
crazygringo wrote: post #331

Earlier quoted context omitted.

I don't think you're understanding. The point is that 20 people in a row will take advantage of your buffer to slow you down again and again and again, which makes you get to your destination later... because they're being selfish to get somewhere faster, and you're not so you get to where you're going slower . We're not talking about where they're changing lanes to take the next exit. We're talking about where your…

You mean 20 people who were trying to merge finally get to merge because someone came past who wasn't a massive asshole?

That person then gets screwed.

Screwed person: WTF?

People doing the screwing: ‘oh thank god’

The really irritating part - society saying ‘oh, that’s not happening you should continue to be screwed’

Re: Hard-braking events as indicators of road segment crash risk

#442

Post by alistairSH »

mountain_peak wrote: post #46
presidentender wrote: post #20

I got one of those dongles from my insurance company that plugged into the ODB2 port and reported my driving habits. I was a bad driver. It would frequently beep at me to let me know that I had braked too hard. I was mystified. "What should I have done differently," I'd think, as I raged at the objective machine that judged me so. The next time my brother came to visit, he called mom. "Oh, and presidentender is a goo…

Maintaining a safe following distance is incredibly challenging on busy freeways where hard braking is often 'required'. Most people have likely found themselves in this situation: vehicle changes lanes in front of you; you slow down to maintain a safe following distance, another car sees a gap and changes lanes in front of you. Repeat for your entire commute. Incredibly frustrating, and I've driven all over North Am…

Now try it with a heavy trailer, where you need even more room to brake and maneuver safely. People are just idiots.

Re: Hard-braking events as indicators of road segment crash risk

#443

Post by thechao »

ehnto wrote: post #367
crazygringo wrote: post #331

Earlier quoted context omitted.

I don't think you're understanding. The point is that 20 people in a row will take advantage of your buffer to slow you down again and again and again, which makes you get to your destination later... because they're being selfish to get somewhere faster, and you're not so you get to where you're going slower . We're not talking about where they're changing lanes to take the next exit. We're talking about where your…

I understand perfectly, 20 years driving, I think people just don't like that the safe answer is to be slow. You will not fix others behaviour, so your options are be slow and generous, get out of the chaotic lanes (unless that's all of them), or join them and be aggressive, claim space, be stressed and annoyed your whole trip. There is no solution to traffic here sorry, this is more about managing your own frustrati…

I object to the "late" argument made by etho's parent. The difference in time to destination will inevitably be dominated by lights, in city travel, not by modest speed differences (say 45 vs 55) on a highway. Being safe & out of the way is the trick! It would be nice if we got rid of left & u turns and build our roads for that!

Re: Hard-braking events as indicators of road segment crash risk

#444

Post by closewith »

taneq wrote: post #408
ehnto wrote: post #367

Earlier quoted context omitted.

I understand perfectly, 20 years driving, I think people just don't like that the safe answer is to be slow. You will not fix others behaviour, so your options are be slow and generous, get out of the chaotic lanes (unless that's all of them), or join them and be aggressive, claim space, be stressed and annoyed your whole trip. There is no solution to traffic here sorry, this is more about managing your own frustrati…

The issue is that when you slow down, you’re (a) creating ‘turbulence’ in the traffic flow with increased speed differential between cars and increased lane changes, which increases accident risk for everybody, and (b) it’s not even solving the problem because you still perpetually have some impatient driver wedging themself in directly in front of you, deleting your buffer zone. It’s safer to drive a little closer,…

> The issue is that when you slow down, you’re (a) creating ‘turbulence’ in the traffic flow with increased speed differential between cars and increased lane changes, which increases accident risk for everybody, and (b) it’s not even solving the problem because you still perpetually have some impatient driver wedging themself in directly in front of you, deleting your buffer zone.

That's very obviously not true. Slowing down always reduces energy in the system and always reduces global turbulence. It's one of the reasons that countries that lower speed limits see journey times reduce.

Re: Hard-braking events as indicators of road segment crash risk

#445

Post by OvervCW »

pishpash wrote: post #80
drewda wrote: post #3

What is the actual use of this? This research team used Google's first-party location data to identify San Jose's Interstate 880/US 101 interchange as a site with statistically extreme amounts of hard braking by Android Auto users. But you don't need machine learning to know that... San Jose Mercury News readers voted that exact location as the worst interchange in the entire Bay Area in a 2018 reader poll [1] It's n…

Indeed why would you even need this or a poll? The crash statistics already exist. What's the purpose of a proxy predictor unless the label is something too low signal to detect but may become a big issue later. The only such case is a new road that recently opened.

>unless the label is something too low signal to predict

>Also, crashes are statistically rare events on arterial and local roads, so it can take years to accumulate sufficient data to establish a valid safety profile for a specific road segment.

That is exactly what this article is about.

Re: Hard-braking events as indicators of road segment crash risk

#446

Post by closewith »

HPsquared wrote: post #403
adw wrote: post #390

Earlier quoted context omitted.

American road laws are insane here. The law should be simple; you must be in the outside lane at all times unless you are overtaking, and once you're done overtaking, you should merge back into the outside lane. https://www.highwaycodeuk.co.uk/overtaking.html

Confusingly, the slow lane is called the "inside lane" in the UK, even though it's on the edge of the road and the fast lanes are in the middle.

That used to be the case in Ireland too, but confusion due to cultural contamination means pretty much everyone moved to numbering lanes (from the "outside"/"slow"/leftmost lane).

Re: Hard-braking events as indicators of road segment crash risk

#447

Post by alistairSH »

ehnto wrote: post #367
crazygringo wrote: post #331

Earlier quoted context omitted.

I don't think you're understanding. The point is that 20 people in a row will take advantage of your buffer to slow you down again and again and again, which makes you get to your destination later... because they're being selfish to get somewhere faster, and you're not so you get to where you're going slower . We're not talking about where they're changing lanes to take the next exit. We're talking about where your…

I understand perfectly, 20 years driving, I think people just don't like that the safe answer is to be slow. You will not fix others behaviour, so your options are be slow and generous, get out of the chaotic lanes (unless that's all of them), or join them and be aggressive, claim space, be stressed and annoyed your whole trip. There is no solution to traffic here sorry, this is more about managing your own frustrati…

There is no solution to traffic here

There is, people just don’t want to hear it, and it isn’t a quick fix…

Build more of our towns and cities such that driving everywhere isn’t necessary.

Re: Hard-braking events as indicators of road segment crash risk

#448

Post by sagarm »

4gotunameagain wrote: post #440
sspehr wrote: post #421

Google Maps is definitely one of the technically coolest big tech products imo. It's fascinating what kind of non-obvious insights you can get from the combined user data (E.g. Crowdedness of public places, insights like in the article etc.)

The value of said data is tremendous, and could lead to great societal benefits if available for research. So much so that I would argue that google (et al) should be compelled to make the data publicly available. They have enough money, let's make society better.

They are making this data publicly available -- after aggregation and anonymization.

Re: Hard-braking events as indicators of road segment crash risk

#449

Post by MattRix »

mountain_peak wrote: post #46
presidentender wrote: post #20

I got one of those dongles from my insurance company that plugged into the ODB2 port and reported my driving habits. I was a bad driver. It would frequently beep at me to let me know that I had braked too hard. I was mystified. "What should I have done differently," I'd think, as I raged at the objective machine that judged me so. The next time my brother came to visit, he called mom. "Oh, and presidentender is a goo…

Maintaining a safe following distance is incredibly challenging on busy freeways where hard braking is often 'required'. Most people have likely found themselves in this situation: vehicle changes lanes in front of you; you slow down to maintain a safe following distance, another car sees a gap and changes lanes in front of you. Repeat for your entire commute. Incredibly frustrating, and I've driven all over North Am…

It’s not challenging at all. You leave the buffer. If someone sees the gap and merges into it, that’s fine! You always maintain the buffer.

It’s not hard to do. It’s only frustrating if you let it be. It really barely slows you down at all.

Re: Hard-braking events as indicators of road segment crash risk

#450

Post by sagarm »

drewda wrote: post #282
pishpash wrote: post #85

Earlier quoted context omitted.

On the interchange in question, they can always redo how the merge is designed in the same space. There is no excuse for that.

Please see: > It's not a lack of knowledge by Caltrans or Santa Clara County's congestion management agency that is keeping that interchange as-is. Rather, it's the physical constraints of a nearby airport (so no room for flyovers), a nearby river (so probably no tunneling), and surrounding private landowners and train tracks. The most recent budget estimate is $1bn for any changes to this interchange

$1B to avoid ending a lane before the intersection. Insane.
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