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Author Topic: EDR post-crash data  (Read 774 times)

Offline dnl4ever

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EDR post-crash data
« on: March 06, 2011, 05:56:15 am »
Recently I was in an accident & I got the data pull out from the event data recorder from my vehicle. 
It showed the Post-Crash Data indicated a maximum change in velocity of 3.3 mph
(5.3 km/h). Could anyone have experience or expertise in this area have more explanations of the data.

1. under what conditions would the change in velocity show a higher reading?
i mean why would it be 3.3 mph?
2. what if the data reads 22.2 mph? 33.3 mph? 44.4 mph? what did it all
mean?
3. would the low reading indicated 1 second before the accident my car was
stop (stationary)?
4. would this data indicate the estimated speed of my vehicle during the
accident?
5. would the low data come into a conclusion that the vehicle speed was
really slow during the accident?
6. any more helpful explanations and information that can be concluded from
this data?

any comments? opinions? ideas?

thank you in advance.
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Offline No H2O

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Re: EDR post-crash data
« Reply #1 on: March 06, 2011, 09:35:46 am »
My GPS provides track logging which shows my speed along my route in detail.

If I didn't have witnesses, it would have proved handy when I got rear-ended while I was already stopped for several seconds.
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Offline Turbo Bob

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Re: EDR post-crash data
« Reply #2 on: March 06, 2011, 10:59:35 am »
Quote from: No H2O on March 06, 2011, 09:35:46 am
My GPS provides track logging which shows my speed along my route in detail.

If I didn't have witnesses, it would have proved handy when I got rear-ended while I was already stopped for several seconds.

Is it court admissable?  From having dealt with police in the past when collecting fraud evidence, everything has to be so carefully collated and not touched in any way (from a data analysis point of view).  I would imagine if your GPS isn't calibrated in some way then it wouldn't be able to be used anyway?  In the UK even the police equipment has to be calibrated daily.
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Offline No H2O

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Re: EDR post-crash data
« Reply #3 on: March 06, 2011, 11:18:36 am »
Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
Is it court admissable?

I don't know but I would believe it more than a lying witness.

Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
From having dealt with police in the past when collecting fraud evidence, everything has to be so carefully collated and not touched in any way (from a data analysis point of view).

Well I don't know how the data could be modified; I certainly can't not that I tried. But I am sure there are rooms 20 stories down that could.

Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
I would imagine if your GPS isn't calibrated in some way then it wouldn't be able to be used anyway?  In the UK even the police equipment has to be calibrated daily.

A GPS is a whole lot more accurate than a "well it looked like he was doing XX km/hr" witness. Actually, I did the calculations once and they are far more accurate than your average speedometer. The sats each have three Cs beam frequency standards on board and the system is monitored from earth stations.
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Offline Turbo Bob

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Re: EDR post-crash data
« Reply #4 on: March 06, 2011, 06:18:39 pm »
Quote from: No H2O on March 06, 2011, 11:18:36 am
Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
Is it court admissable?

I don't know but I would believe it more than a lying witness.

Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
From having dealt with police in the past when collecting fraud evidence, everything has to be so carefully collated and not touched in any way (from a data analysis point of view).

Well I don't know how the data could be modified; I certainly can't not that I tried. But I am sure there are rooms 20 stories down that could.

Quote from: Turbo Bob on March 06, 2011, 10:59:35 am
I would imagine if your GPS isn't calibrated in some way then it wouldn't be able to be used anyway?  In the UK even the police equipment has to be calibrated daily.

A GPS is a whole lot more accurate than a "well it looked like he was doing XX km/hr" witness. Actually, I did the calculations once and they are far more accurate than your average speedometer. The sats each have three Cs beam frequency standards on board and the system is monitored from earth stations.

All good points, but unless it's been calibrated then it's useless in court.
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Offline tenpenny

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Re: EDR post-crash data
« Reply #5 on: March 06, 2011, 10:46:01 pm »
To get to the original point, I would take the EDR data to show that at time of impact, you were going 3.3 mph.
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Offline vdk

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Re: EDR post-crash data
« Reply #6 on: March 07, 2011, 01:52:57 am »
Okay. Someone tell me what cars have this event data recorder? This is news to me...
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Offline johngenx

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Re: EDR post-crash data
« Reply #7 on: March 07, 2011, 09:13:08 am »
Quote from: vdk on March 07, 2011, 01:52:57 am
Okay. Someone tell me what cars have this event data recorder? This is news to me...

A LOT of newer ones.
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Offline 5 Wheel Drive

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Re: EDR post-crash data
« Reply #8 on: March 07, 2011, 09:33:49 am »
I think that data can be extracted from the computer of most modern cars.
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Offline maritime_storm

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Re: EDR post-crash data
« Reply #9 on: March 11, 2011, 06:31:41 am »
Most OBDII systems will collect and store data that can be retrieved, they do this to aid diagnostics.
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Offline mmret

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Re: EDR post-crash data
« Reply #10 on: July 10, 2011, 05:57:49 am »
Quote from: tenpenny on March 06, 2011, 10:46:01 pm
To get to the original point, I would take the EDR data to show that at time of impact, you were going 3.3 mph.

Its max CHANGE in velocity. IE acceleration. Probably sampled 50ish times a second or something.

Not sure if the units are correct.
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