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Studies find automatic braking can cut crashes over 40%

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Re: Studies find automatic braking can cut crashes over 40%

#61

Post by giantg2 »

branon wrote: post #10

Oof, my experience with with auto-brake in a 2021 Subaru Crosstrek (anecdotal, sample size of one, all that good stuff) is much the opposite. It's too sensitive and tends to brake shockingly hard during fairly mundane maneuvers. When backing up near a wall/obstacle, the auto-brake seems to kick in when anything is closer than three or four feet away from the bumper. I use my mirrors and have an accurate impression of…

"I'm only one car-length away and still going 40 MPH. Another half-second and they'll be gone,"

These numbers must be wrong, and are terribly unsafe.

Just off the top of my head, that's like travelling 60fps for .5 seconds is 30 feet, which exceeds 1 car length, even for my truck.

Re: Studies find automatic braking can cut crashes over 40%

#62

Post by ezfe »

erisian wrote: post #8

Fuck no. I had to deal with a rental that had driver assist technology and it damn near killed me. There was a boulder on the road around a blind corner and the car fought me trying to swerve out of the way, I barely avoided it. Imagine auto braking on black ice or because of a faulty sensor. We're giving immature technology too much control of the vehicle.

That's bad driver assist, not a bad premise. My car will fight you a little, but it always gives me control when I insist.

Wrt. black ice, if there's a stopped car in front of you, black ice or no you want to try to stop.

Re: Studies find automatic braking can cut crashes over 40%

#63

Post by tshaddox »

branon wrote: post #33
CydeWeys wrote: post #27

Earlier quoted context omitted.

Honestly, I feel like a lot of the people complaining about this feature are just bad drivers who regularly drive unsafely and are now getting called out on it. This in particular: > Sometimes, though, I will allow the distance between myself and the next car to close, for example, if they're turning and will be gone in a second anyway. The Subaru then ruins my well-calculated slowdown maneuver by slamming on the bra…

That was just one example. I've clarified my original comment, previously I was using the term "car length" in a way that did not make sense to others. I should have said "seconds of follow distance" All of this is infinitely nuanced anyway. There might not be a side street. It can happen on the highway too when cars switch lanes to exit. And it's not like it happens every day, it's fairly rare, I just have yet to ac…

2 car lengths? So like, 250 milliseconds at 40 miles per hour?

Re: Studies find automatic braking can cut crashes over 40%

#64

Post by brookst »

dazc wrote: post #51
branon wrote: post #10

Oof, my experience with with auto-brake in a 2021 Subaru Crosstrek (anecdotal, sample size of one, all that good stuff) is much the opposite. It's too sensitive and tends to brake shockingly hard during fairly mundane maneuvers. When backing up near a wall/obstacle, the auto-brake seems to kick in when anything is closer than three or four feet away from the bumper. I use my mirrors and have an accurate impression of…

> 'Sometimes, though, I will allow the distance between myself and the next car to close, for example, if they're turning and will be gone in a second...' I often wonder what advantage in life people think they are gaining by this behaviour. Care to share?

Reducing the odds of getting rear-ended by absorbing the slack of a conservative following distance rather than braking to maintain the same following distance from 35 to 20 mph.

Re: Studies find automatic braking can cut crashes over 40%

#65

Post by JTbane »

consp wrote: post #7
bhouston wrote: post #2

It feels like a simple thing but I also suspect it is effective from my personal experience. We have automatic braking (fixed: breaking) on my Toyota Rav4: https://www.youtube.com/watch?v=gbnoFbb8G8Q It is a simple thing but the PCS has been triggered 4 times in the last 5 years and never incorrectly. I think I would have stopped soon enough without it (as I've never hit anything in my 20+ years of driving), but it w…

My car (not a toyota) does it too and I've never had it actually brake but the very audible + visual warning signs definitely makes you act tiny fraction sooner (at least that is how it feels). I'm pretty sure it would have stopped otherwise on its own but a bit less pleasant. edit: it also triggers when you go down a steep parking lot onto a flat surface a bit too fast which is interesting but at least valid (with r…

>it also triggers when you go down a steep parking lot onto a flat surface a bit too fast

that's a great feature, I always have to remind friends and relatives to slow down when going down an incline onto the road (they invariably scrape the underside of the car)

Re: Studies find automatic braking can cut crashes over 40%

#66

Post by brookst »

giraffe_lady wrote: post #37
branon wrote: post #10

Oof, my experience with with auto-brake in a 2021 Subaru Crosstrek (anecdotal, sample size of one, all that good stuff) is much the opposite. It's too sensitive and tends to brake shockingly hard during fairly mundane maneuvers. When backing up near a wall/obstacle, the auto-brake seems to kick in when anything is closer than three or four feet away from the bumper. I use my mirrors and have an accurate impression of…

All I can think about is that poll showing that 90% of people think of themselves as above-average drivers. The autobraking isn't getting in your way and you don't need it, it's exactly for you lmao.

Lol, my jeep that auto-brakes for parked cars in garages. Tell me again what I'm doing wrong by going 5mph in a parking garage?

Re: Studies find automatic braking can cut crashes over 40%

#67

Post by sublinear »

I have a 2017 Outback and there exists a cluster of switches on the dash for easily toggling all the EyeSight features.

They actually recommend to disable the "pre-collision braking" feature before driving through an automated carwash. Apart from that situation, I also disable it when I'm facing highly congested traffic for the reasons indicated in the other comments. It's very easy to do. I don't understand why this is a big deal.

I think the system works very well and has saved me several times over the years while approaching intersections and on the highway.

Re: Studies find automatic braking can cut crashes over 40%

#68

Post by giantg2 »

CydeWeys wrote: post #27
branon wrote: post #10

Oof, my experience with with auto-brake in a 2021 Subaru Crosstrek (anecdotal, sample size of one, all that good stuff) is much the opposite. It's too sensitive and tends to brake shockingly hard during fairly mundane maneuvers. When backing up near a wall/obstacle, the auto-brake seems to kick in when anything is closer than three or four feet away from the bumper. I use my mirrors and have an accurate impression of…

Honestly, I feel like a lot of the people complaining about this feature are just bad drivers who regularly drive unsafely and are now getting called out on it. This in particular: > Sometimes, though, I will allow the distance between myself and the next car to close, for example, if they're turning and will be gone in a second anyway. The Subaru then ruins my well-calculated slowdown maneuver by slamming on the bra…

"And I'm 100% in favor of systems that force other drivers on the road to drive more safely as well."

Ug. I'd rather have testing be changed so that safety is increased in all situations by having a competent driver. Most of the situations being described here are simply poor choices on the part of one or more drivers.

For real, who the hell is cutting through lanes of traffic and slamming on brakes because they will miss a turn? Best to remove these people than have them rely on a price of tech to save them in 1 situation but let them continue to be dangerous in another 9 areas.

Re: Studies find automatic braking can cut crashes over 40%

#69

Post by branon »

berberous wrote: post #49
branon wrote: post #33

Earlier quoted context omitted.

That was just one example. I've clarified my original comment, previously I was using the term "car length" in a way that did not make sense to others. I should have said "seconds of follow distance" All of this is infinitely nuanced anyway. There might not be a side street. It can happen on the highway too when cars switch lanes to exit. And it's not like it happens every day, it's fairly rare, I just have yet to ac…

Have you ever looked up stopping distances? https://www.automotive-fleet.com/driver-care/239402/driver-c... I don’t know how accurate the above is, but it suggest that the stopping distance at 40mph is 5-9 car lengths, so I have to agree with the above poster that if you are routinely leaving one car length and your car system is freaking out, you are probably driving unsafely. Keep in my that statistically this coul…

One car length is way more than 15 feet to my mind, probably 40 feet or more depending on speed. See my other comments about how nuanced this entire dialog will inevitably be. Don't you think it's more reasonable to assume we have different definitions of a car length? Perhaps I've used the term in a grossly incorrect manner. "One car length" to me equals "one unit of minimum safe distance taking into account road conditions, traffic conditions, and speed"

Not just 15 feet, that'd be insane!

Re: Studies find automatic braking can cut crashes over 40%

#70

Post by dazc »

brookst wrote: post #64
dazc wrote: post #51

Earlier quoted context omitted.

> 'Sometimes, though, I will allow the distance between myself and the next car to close, for example, if they're turning and will be gone in a second...' I often wonder what advantage in life people think they are gaining by this behaviour. Care to share?

Reducing the odds of getting rear-ended by absorbing the slack of a conservative following distance rather than braking to maintain the same following distance from 35 to 20 mph.

Thanks for answering. Don't do this in some parts of the UK though, where 'crash for cash' is a thing, you may well become a victim.

https://www.abi.org.uk/products-and-issues/topics-and-issues...

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