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This is definitely pie in the sky but I dream of a future where you have so many autonomous vehicles all the road that we can not only collect this data but also incentivize the slow turning wheels of government to fix it.
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Hard-braking events as indicators of road segment crash risk
71–80 of 577 posts
Re: Hard-braking events as indicators of road segment crash risk
#72I 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…
Safe following is super important. Few years back about a month after I bought a new car I was driving to work keeping a larger than normal gap thanks to a bit of "new car" anxiety. I was in the left lane, keeping pace with a cluster of three cars ahead of me, two of them tailgating. I don't know what happened but within seconds the middle car swerved, side swiped a car in the middle lane then rear ended the lead car…
Just like Lightning McQueen: https://www.youtube.com/watch?v=AvhFjVj7k44
Re: Hard-braking events as indicators of road segment crash risk
#73Earlier quoted context omitted.
It doesn’t - but people don’t necessarily make rational choices regarding speed and driving. There’s a tendency to de personalize other drivers. A slight increase in average speed really only makes a significant difference over long drives. (5 mph increase over a 10 hour drive can cut off 50 minutes). Otherwise we are talking about small differences in efficiency. (I would be very open to another opinion here.). My o…
> (5 mph increase over a 10 hour drive can cut off 50 minutes) You can't really say that without knowing the starting speed, or alternatively the distance. All you can say is that a 5 mph increase over a 10 hour drive with get you 50 miles farther.
I would argue I can still say it /can/ cut off 50 minutes.
If you do a comparison of a 600 mile trip at 60 vs 55 you’re pretty close.
But yes, to be pedantic and more exact, you are spot on that it will get you 50 miles closer.
But in real world examples,
If you’re traveling 700 miles.
65 vs 70, 70 will reduce your time by 43 minutes.
So in certain scenarios, 5 mph difference must be able to save you 50 minutes ! ;)
(I do understand your point, and you’re correct. I’m just poking fun at it- my point with the mph difference is because 50 miles doesn’t have the same translation for most people at 50 minutes, but is a more accurate data approach. )
Re: Hard-braking events as indicators of road segment crash risk
#74Earlier 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.
(Though for an insurer, it’s the same thing - whether you’re risky because you’re a bad driver or because you drive on poorly constructed roads or around other poor drivers is inconsequential to them)
Yeah well fuck insurers. We are supposed to get spied upon by our cars with their blackboxes, by our insurers, by Google, by national security services of various countries... and what do we get in return? Dinged for other people's bad behavior which we cannot reasonably control. Either you follow the car in front of you very closely and get hard braking events, or other people switch lanes in front of you and in the worst case slowing down during lane change, provoking yet another hard braking event.
Fuck all of that.
Re: Hard-braking events as indicators of road segment crash risk
#75Nice research. This is fairly well known in insurance circles. Most auto insurers that do telematics consider hard braking the strongest indicator of risk. One of the things that we do at work (Cambridge Mobile Telematics) is build tools to deal with this risk. We have apps that monitor driving and we play a tone to indicate that a hard braking event was detected. Simply letting people know that they had a hard braki…
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.
Driving on bad roads is just as bad for insurance as a bad driver is.
Re: Hard-braking events as indicators of road segment crash risk
#76[dead]
Ok but where is the public Maps overlay for this? Is it available?
Re: Hard-braking events as indicators of road segment crash risk
#77Earlier quoted context omitted.
The landing page video's first incident is a car coming from behind and from the right, cutting off the filming car. The filming car didn't react at all when instant (but measured) braking would've been safer to start building a distance buffer. One thing HPDE taught me is that most people under brake in dangerous situations because they simply don't know the limit of their vehicle nor the sensitivity range of the br…
It certainly makes sense as a proxy for competence across a diverse population for insurance purposes. You have a baseline of hard braking events that a competent driver may encounter under normal circumstances. If a driver routinely exceeds that number, they are either unable to correctly estimate closing distance and reaction times, which makes them higher risk for causing accidents, or they are driving abnormally…
> You said it correctly with "would've been safer to start building a distance buffer", that is the proxy the insurance companies want to use for risk assessment.
Then use it? Mandate reaction speed tests or other driving mechanics competency evaluation (not road sign comprehension) and watch insurance margins explode.
The driver in my example did poorly and scored top marks in the heuristic.
Re: Hard-braking events as indicators of road segment crash risk
#78I 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…
Okay I'm thinking of a very Shenzen kind of gizmo for your car that projects a bright red laser "keep out" box on the road in front of your car which is adjusted in size for your current speed.
Re: Hard-braking events as indicators of road segment crash risk
#79Earlier quoted context omitted.
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…
This is accurate in many ways. I use the auto cruise feature on my car frequently and I notice several things happen unless I set the distance as close as possible (which I don’t like to do. ). 1. In any amount of traffic above “a few cars” people will cut in front of me, sometimes two, negating the safe following distance. Regardless of speed. 2. If I have a safe following distance while waiting for someone to get o…
Just drive in the slow lane and you won’t have this problem. The people cutting in front of you rarely want to be in the slow lane.
Re: Hard-braking events as indicators of road segment crash risk
#80What 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.