What a Black Box Data Dump Looks Like
An anonymous reader writes "Massachusetts Lt. Governor Tim Murray recently crashed his Ford Crown Victoria while reportedly traveling 108 mph. The car was pretty much shredded, but Murray walked away without major injuries. According to data from the car's black box, Murray and the Crown Vic experienced the equivalent of 40 gravities during the crash. The data contradicts the story he gave police. Maybe we should strap black boxes to all our politicians."
So, the first thing you should do after a car accident is to find and destroy its black box, so your insurance company would have no way to avoid paying the, what, insurance?
Some luck was involved, but anything that and car that can handle a crash at 108mph ( a bazilion kph for those of you out of the US) is damn amazing. I love engineers. They have made our lives so much better and are so unappreciated.
If he was going that fast, he'd be dead. He didn't have a single scratch on him at the press conference. If the tires spin out on black ice, does the black box adjust for that? or would it just assume he's actually moving at the rate the tires are spinning?
"... Maybe we should strap black boxes to all our politicians."
Don't be foolish, they would explode from all the weaving, diving, bobbing, feints, corrections, double-backs and plowing through verbal feces (the black boxes, not the politicians.
A feeling of having made the same mistake before: Deja Foobar
Maybe we should strap black boxes to all our politicians.
Explosives would be far more beneficial to society in general...
I think they buried the lead here... 100mph, sans seat-belt, and he walked away? That's goddamn incredible. I've seen first hand what an accident at 170km/h looks like (on the Autobahn) and walking away seems basically impossible.
-- Let us endeavor so to live that when we pass even the undertaker shall be sorry. -- M. Twain
The black box is hard mounted to a solid part of the car. The black box and associated accelerometers stop hard.
A person in a seat, surround by air bags and wearing a seat belt does not stop nearly as hard.
Now if there had been no seat belt and no air bags .....
"... Maybe we should strap black boxes to all our politicians."
Don't be foolish, they would explode from all the weaving, diving, bobbing, feints, corrections, double-backs and plowing through verbal feces (the black boxes, not the politicians.
Exploding politicians would still be nice.
(At least, ones that explode if they do too much weaving, diving, bobbing, feints, corrections, double-backs and plowing through verbal feces.)
"What in the name of Fats Waller is that?"
"A four-foot prune."
They will ask Walmart for video footage to identify who bumped into your car and drove away.
At least that's what the insurance told my wife once...
And what do you think the G in G-force stands for?
http://en.wikipedia.org/wiki/G-force
1G is equivalent to Earth-normal gravity (an object at rest on the planetary surface). 40G is equivalent to 40 times Earth-normal gravities. Gravities is commonly used when discussing force related to multiples of Earth-normal gravity.
It seems, looking at the raw data, that while "40G's" is quoted by the summary, and words like "totalled" are used, the data recorded by the box only shows a 15MPH crash.
There is other dubious data - for example, the box sensors indicate that the box accelerated by 22MPH while the data was being retrieved - ie. while sitting on some investigators desk - seems unlikley!
The crash acceleration data itself contains some very high amplitude high frequency oscillations - with a frequency around 200Hz. These are much bigger than the crash itself. That could be vibrations going through the car after something goes "twang", but could even be the stereo bass turned up loud. These vibrations are where the "40g" comes from - the actual crash is more like 1 or 2 g.
Note however there may be more information that wasn't recorded.
There's a disclaimer right there on page one:
Accident reconstructionists must be aware of the limitations of the data recorded... should compare the recorded data with the physical evidence...
Those disclaimers do mean things. The data was never intended to be used as a "black box"; That's purely media hyperbole comparing it to what's in an aircraft, which is designed to aid in accident reconstruction. The courts routinely dismiss GPS tracking data on phones used as evidence that the driver wasn't speeding because the device isn't meant to be used for that, and isn't precise enough anyway. An officer's radar gun, however, is.
That said... let us all look to the sky now and return to mumblings about conspiracies between or about the government and/or insurance companies.
#fuckbeta #iamslashdot #dicemustdie
They will ask Walmart for video footage to identify who bumped into your car and drove away.
At least that's what the insurance told my wife once...
I need fore and aft GoPro cameras in my car - record my drives. What amazing things I could turn over to the CHP! The people passing on the shoulder, tailgating, yakking on phones. putting on make-up, shaving, picking noses...
A feeling of having made the same mistake before: Deja Foobar
At a auto racing school I attended, the "If you know you're going to crash" advice was to cross your arms on your chest and go limp. A death grip on the steering wheel is a sure way to break your elbows.
From TFA: He was doing 75mph in the seconds leading up to the crash, then accelerated to 108mph. This lead them to believe he probably fell asleep at the wheel. I sympathize, having lived in MA 75mph on the Pike is nothing (people drive far faster). Also having lived in MA I can sympathize with him falling asleep at the wheel. Massachusetts residents often drive while asleep or at least while dozing.
*headdesk*
So G is short for "G-force" - well what's that short for? That's certainly not a unit of measure, but a scale. Anyway, "Big G" is a universal constant. You're probably thinking of small g, often used as a measure of acceleration, representing the acceleration due to gravity at earth's surface. And as 99.9999998% of us have only ever experienced this one gravity well, it's usually not considered necessary to say "Earth surface gravities" and so "gravities" is a perfectly acceptable synonym for this (somewhat vague) unit of measure, the symbol for which would be "g" (NOT "G").
Since accident investigators and car companies so rarely need to use the Gravitational Constant in their calculations (not even a Hummer is large enough to have gravitational attraction be a factor in an accident), it's perfectly acceptable for them to represent g as G as there's no ambiguity in their field. And it even helps to distinguish between g as in gravitational acceleration and g as in gram.
They will ask Walmart for video footage to identify who bumped into your car and drove away.
At least that's what the insurance told my wife once...
I need fore and aft GoPro cameras in my car - record my drives. What amazing things I could turn over to the CHP! The people passing on the shoulder, tailgating, yakking on phones. putting on make-up, shaving, picking noses...
STOP S.T.A.L.K.I.N.G MY WIFE!
Air bag.
The accelerometer attached to the car frame measured 40G. The driver's body would experience much less. What surprises me is surviving the subsequent rollover while not wearing a belt. People have been killed in much lower speed crashes getting bounced around the inside of a car or ejected.
Have gnu, will travel.
Never in my life have I ever fell asleep at the wheel or even come close. If you fall asleep at the wheel its not an accident, thats criminal negligence. NO it could not 'happen to anyone' because most people arent stupid enough to operate a speeding hunk of metal while drowsy.
Good-bye
I can see the insurance companies now: "Sorry Mr. Smith, but the speed limit is 60 and you were travelling at 61 so we are denying your claim."
No insurance policy that I'm aware of excludes coverage if you're speeing. I'm not even sure that's legal.
Insurance will also cover you if you're committing a felony DUI or driving recklessly.
They may cancel your policy afterwards and refuse to write you a new policy, but they won't refuse to cover you just because you were going over the speed limit at the time of the accident.
I have fore and aft cameras on my vehicle that record when driving. It is fairly easy to setup. A mini camera mounted above the rear-view mirror. Another at the top of the back windshield. I replaced the stock lens on each with wide-angle to get a broader view but it is not as fun to watch the fish-eye results. The feeds are recorded on a vanilla 100 USD 4-channel home security camera system mounted in the trunk. Replaced the hard drive with an SSD and slightly modified to run off DC only. Spent about 225 USD on the entire system.
Nothing much to get excited about that has been recorded. Bad drivers, people running red lights, etc. Just waiting for the day to catch something awesome.
If it wasn't for the insurance problems I would probably replace the wing mirrors with camera and in-car monitors too. The field of view is better, with no blind spot, the distortion is less. Perhaps some brave manufacturer will try it, possibly with emergency fold-out mirrors in case the camera fails.
From scarped cliff or quarried stone she cries "A thousand types are gone, I care for nothing, no not one."
Get a reversing camera. You will thank me the first time you don't drive over something below the rear sill.
From scarped cliff or quarried stone she cries "A thousand types are gone, I care for nothing, no not one."
Sure, seatbelts and airbags save car drivers -- which is why I am against them.
As a pedestrian, cyclist and motorcyclist, I think that ANYTHING that increases car driver confidence is... bad.
Get rid of seatbelts. Get rid of airbags. Put broken glass into the dashboard.
That should act to straighten out a lot of car drivers!
And, who knows? Maybe the additional care will balance out the removal of protection; hey, we may even have a reduction of fatalities.
Smear a bit of blood on the glass in the factory, just to be sure to get the point across.
Just another "Cubible(sic) Joe" 2 17 3061
Massholes. Trust me, I live in MA, it's a plague.