4 ms·

quote the bill, "(1) shall require event data recorders to capture and store data related to motor vehicle safety covering a reasonable time period before, duri

quote the bill, "(1) shall require event data recorders to capture and store data related to motor vehicle safety covering a reasonable time period before, during, and after a motor vehicle crash or airbag deployment, including a rollover;" so I suppose the question is, what's a reasonable time period?

Noms_Tiem 15y ago
Since a crash can happen at literally any time while driving, and the bill requires data to be recorded before a crash, I suspect "reasonable" would be "any time the vehicle is turned on." I guess it depends, then, on how loosely you define "crash."
- skymt 15y ago
  If I were implementing one of these black boxes, I'd interpret "reasonable" in a privacy-preserving way: use a ring buffer that stores, say, 4 minutes of data, and stop recording 2 minutes after a crash is detected. That should provide enough data about the crash without being useful to someone who wants to spy on the driver.
- recursive 15y ago
  A car could be in a crash even when it's not turned on or driving.
adnam 15y ago
Black-box recorders exist that store data onto an SD card in a constant loop. History depends on the available capacity - around 1 day for a 16GB card. When an accident-event is detected (sudden acceleration or deceleration) the device permanently stores 1 minute either side of the event. http://www.roadhawk.co.uk/ http://www.roadhawk.co.uk/
excuse-me 15y ago
Airbag computers already log the acceleromter/brake pedal data they used to make the decision to fire. This was introduced to protect the makers - there were lots of fears/claims that airbags had gone off and caused crashes. The car makers wanted to prove that you were braking hard or had hit some thing when they fired. I suspect 'a reasonable time' means that the system needs an internal battery/static memory so that the data is available later after the engine is turned off or if the car battery is disconnected in the accident.
- grecy 15y ago
  My understanding is that airbags are triggered when a threshold of very sudden deceleration is crossed and has nothing to do with the brake pedal.
  - excuse-me 15y ago
    Mine at least is linked into the rest of the car - it sense weight on the seat and I think it's only active when the key is in. Obviously it wouldn't be coded fire only if you were braking ! But it might be at least logging all the data that is used for the seat belt pre-tensioning, ABS, stability control, traction control and all the other safety systems.

Noms_Tiem 15y ago

Since a crash can happen at literally any time while driving, and the bill requires data to be recorded before a crash, I suspect "reasonable" would be "any time the vehicle is turned on." I guess it depends, then, on how loosely you define "crash."

skymt 15y ago
If I were implementing one of these black boxes, I'd interpret "reasonable" in a privacy-preserving way: use a ring buffer that stores, say, 4 minutes of data, and stop recording 2 minutes after a crash is detected. That should provide enough data about the crash without being useful to someone who wants to spy on the driver.
recursive 15y ago
A car could be in a crash even when it's not turned on or driving.

adnam 15y ago

Black-box recorders exist that store data onto an SD card in a constant loop. History depends on the available capacity - around 1 day for a 16GB card. When an accident-event is detected (sudden acceleration or deceleration) the device permanently stores 1 minute either side of the event. http://www.roadhawk.co.uk/ http://www.roadhawk.co.uk/

excuse-me 15y ago

Airbag computers already log the acceleromter/brake pedal data they used to make the decision to fire. This was introduced to protect the makers - there were lots of fears/claims that airbags had gone off and caused crashes. The car makers wanted to prove that you were braking hard or had hit some thing when they fired. I suspect 'a reasonable time' means that the system needs an internal battery/static memory so that the data is available later after the engine is turned off or if the car battery is disconnected in the accident.

grecy 15y ago
My understanding is that airbags are triggered when a threshold of very sudden deceleration is crossed and has nothing to do with the brake pedal.
- excuse-me 15y ago
  Mine at least is linked into the rest of the car - it sense weight on the seat and I think it's only active when the key is in. Obviously it wouldn't be coded fire only if you were braking ! But it might be at least logging all the data that is used for the seat belt pre-tensioning, ABS, stability control, traction control and all the other safety systems.