Live data from Hacker News

Hard-braking events as indicators of road segment crash risk

research.google

181–190 of 577 posts

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

#181
post #170

Earlier quoted context omitted.

Even that can be tricky, with the indecisive behavior people use when merging.

That one's easy: leave space in front of you for those merging onto the highway. So much of road etiquette boils down to leaving adequate space so others can maneuver around you. Trying to optimize your travel by destroying any gaps as soon as they appear actually has the opposite effect.

James May calls this "Christian motoring". Golden Rule etc

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

#182

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…

Kudos on you for acknowledging that your behavior changed! It is depressing how many people online are convinced that the emergency braking systems are too aggressive. The best is the cohort that insist these systems will be what causes accidents.

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

#183
post #95

Earlier quoted context omitted.

If you think highway driving requires hard braking, you're a bad driver.

Or stuck on a highway with bad drivers. My local paper's current "bleeds => leads" story is about a head-on highway crash, between a big pickup truck and a wrong-way driver. Less that 4 hours after being posted, that story has already slipped off the front page.

"local drunk dies by misadventure" is a really, really boring news article.

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

#184
post #95

Earlier 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…

If you think highway driving requires hard braking, you're a bad driver.

I just had to hard brake a few days ago. A driver a couple lanes over on 101 slammed on their breaks, rotated 90 degrees, and came to rest across a couple lanes (one of which was mine). Fortunately, I was alert, driving the speed limit, and in the right-most lane, with nobody following me close. The whole thing happened in less than 5 seconds.

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

#185
post #95

Earlier 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…

If you think highway driving requires hard braking, you're a bad driver.

It doesn't normally require hard braking, but when automated emergency braking decides to slam on the brakes at random for no reason in my own car, everybody behind me will share my resulting insurance rate increase.

It's almost as if the purpose of the system is what it does.

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

#186

Earlier 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…

If you think people are going to cut in front of you, provide a safety cushion large enough to account for that. Aggressive drivers almost universally will consume the forward part of the space cushion you leave. At most you will simply need to lift the accelerator to maintain space. The only time someone cutting in front of you should require hard braking is if they also brake hard. It does require patience to do th…

Letting a large fraction of the freeway cut in front of you will turn normal drivers behind you aggressive, or at least aggressive enough to go around you. There's a balance to be struck.

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

#187
post #170

Earlier quoted context omitted.

Even that can be tricky, with the indecisive behavior people use when merging.

That one's easy: leave space in front of you for those merging onto the highway. So much of road etiquette boils down to leaving adequate space so others can maneuver around you. Trying to optimize your travel by destroying any gaps as soon as they appear actually has the opposite effect.

While leaving space is nice, the person on the highway already typically has right-of-way.

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

#188
post #89

Earlier quoted context omitted.

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.

I do drive in the slow lane frequently - and this still occurs. (My go to is to set my cruise 6-9 mph over the speed limit, if passing to smoothly pass and get back over, and spend as much time as possible in the slow lane. ) However - I will say most of the roads I’m on are 2 lanes of traffic. I will have to experiment and see if this doesn’t occur when there are 3 or 4 lanes.

> I do drive in the slow lane frequently - and this still occurs.

One part of your post was about people passing on the right. People won't do that if you're in the rightmost lane.

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

#189
post #2

Nice 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…

> Simply letting people know that they had a hard braking event is an effective mechanism for behavior change Has this been studied in isolation? Many of the tools that notify upon hard braking also are used to impose financial penalties for doing so... I suspect people may be reacting to the financial incentives.

When people learn to do things by reacting to inputs, they learn much better when the input comes soon after the action/inaction they are trying to train, rather than long after. When you can tie specific acts as a driver to a later financial penalty it helps you learn to avoid the specific acts, otherwise you'd stuck having to figure out in three weeks when the bill comes around what you were doing on the date the insurance statement flagged as a hard stop.

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

#190
post #110

Earlier quoted context omitted.

What are these apps or devices? Where can I get one?

They are provided by your auto insurance company. A potential privacy nightmare, they track your movement. They also can get you a much lower rate.

If you don't want to go through your insurance company you can check out an app we built called RoadClub. You get points for safe driving behavior - and you can get the hard brake alerts. Is it a bit annoying? yes. You can't just drive agressively - you need to give space to slow down. I still struggle with it.
Post reply on HN