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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

#371

Post by Sohcahtoa82 »

crest wrote: post #292
maerF0x0 wrote: post #263

Earlier quoted context omitted.

It's not the fastest often because it's oversubscribed and people do not understand that the car has a 3rd, mostly underuntilized, state of neither pedal depressed (ie "coasting") ... so they create cascading braking pileups ...

If everyone that had it turned adaptive cruise control sigh .

So many people don't even use regular cruise control. They'll have nobody in front of them for miles and their speed yo-yos between 60 and 65 mph. And if you pass them because your cruise is set at 66 mph, they'll speed up to match, but then eventually decide to pass you, get in front, and slow back down to 60. The only way to end the stupid cycle is to go 70-75 mph until there's at least 1/4 mile between the two of you.

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

#372

Post by Sohcahtoa82 »

leviathant wrote: post #301
chausen wrote: post #222

Earlier quoted context omitted.

It brings me peace to see other people thinking this way. You should be an active participant on the highway, making decisions to maximize flow. Leaving space so people can merge, controlling speed to smooth slowdowns, anticipating traffic patterns, etc. All of the people tailgating are contributing to the congestion. https://youtu.be/iHzzSao6ypE

The trick I keep in mind in situations like this is to look at brake lights ahead of me. If cars are braking and I'm accelerating, I'm probably going to end up driving very inefficiently. By letting off the accelerator, I don't close the gap as quickly, and eventually, the turbulence in the traffic flow steadies out. Instead of stopping and starting, I roll at an averaged out speed, which doesn't feel as frustrating…

> I roll at an averaged out speed, which doesn't feel as frustrating (it's kind of relaxing) and is better for fuel economy

Yup. The brake pedal is an evil device that converts cash into brake dust and waste heat. Before I got an EV, I always drove in such a way to use the pedal as little as possible. As a result, in my previous car that was stickered at 24 mpg city/30 mpg highway, I averaged 32 mpg. I don't even drive slow, I just drive smoothly. If your average speed is going to be 5 mph, then you'll get much better economy driving a constant 5 mph than your speed being a sine wave between 0 and 10 mph.

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

#374

Post by CGMthrowaway »

Barbing wrote: post #368
CGMthrowaway wrote: post #359

Earlier quoted context omitted.

This is a long thread of people talking past each other. The bottom line is simply this: if you want to drive with a larger-than-average following distance (call it whatever you want, a safety buffer, a "proper" following distance, the point is it is a distance less than the average following distance of the other drivers on the road) then you have to accept that you will not be able to drive at the same speed as the…

>It can be psychologically frustrating True, though- I like being a traffic hacker--come on in, plenty of room!

Weaving into the little spaces is my version of traffic hacking. I estimate every time I can do that, I shave 1-2 seconds off of my commute.

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

#375

Post by justkys »

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…

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

#376

Post by DoctorOetker »

JimBlackwood wrote: post #106
advisedwang wrote: post #14

Earlier quoted context omitted.

Insurance is thinking about hard braking as an indicator of a driver with riskier behaviour. Google is showing that it can also be an indicator of risky road designs. These actually kind of point in opposite directions in terms of the causes of hard braking. The certainly can be used in different ways.

They point in opposite directions because they’re not measuring the same things. Google is measuring where on the road most hard braking events happen. Insurers measure who is having the most hard braking events.

It should also be generalize to when (for example a specific corner during dusk or dawn), and for insurers what would also be an important factor would be what other cars are nearby at the hard-braking event, it's not exactly productive to flag the chicken in chicken-or-dare scenario's.

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

#377

Post by justkys »

frogulis wrote: post #332
overfeed wrote: post #327

Earlier quoted context omitted.

> I will never understand why this is so rage-inducing for people Putting my armchair psychoanalyst hat on: I think American society embeds a need to be the "winner", and are you winning if end up behind another driver who's contending for "your" spot? If you've driven elsewhere for a while, you start noticing subtle driver differences, such as drivers who want to merge into your (slower) lane never braking to merge…

Driving in Melbourne -- I won't generalise to the wider Australia -- is often much the same. Comparing to the experience of being a passenger on a bike in Saigon, the level of cooperation there is way higher, possibly due to a sort of necessity. I had this feeling while observing traffic there, that, while the latency and throughput of the roads during high traffic times are still kinda awful, at least for bikes ther…

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

#378

Post by bramblerose »

Gigachad wrote: post #358
Someone1234 wrote: post #28

This type of research is highly valuable but too rare; this is generally because of how we view Road Accidents at a core level: - Road Accidents: "A driver caused this, let's determine who, and find them at fault." - With Air Accidents: "The system caused this, let's determine which elements came together that ultimately lead to this event." The first is essentially simplifying a complex series of events into somethi…

Because for air travel we pre filter out the morons who are drunk, untrained, scrolling facebook, etc. Any incident left is overwhelmingly more likely a systems issue. For a road incident, the most likely cause was just one driver was violating one or more rules. The only system failure was not canceling their license beforehand.

While that is true, "Drivers consistently ignoring rules" is also a systems issue, which can be mitigated through e.g. better road design (narrower roads reduce speeding, for example).

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

#379

Post by binkHN »

Gud wrote: post #120
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…

I can only speak for Europe, but driving too closely to the driver in front is unfortunately how 90% of drivers drive. Unless it’s in Netherlands, where it’s 100%.

I haven't been to the Netherlands, but I would say Paris is pretty close to 100%!

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

#380

Post by tsoukase »

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…

Inter-car distance is always a safety factor but can immensely reduce lane throughput. There is a compromise. I remember a few decades ago, in California at least, they suggested the drivers keep a one-car length distance from the leading car for every 10m/h speed. Funny that I had to convert it in km/h.
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