What happens in a car crash? - HotUKDeals
We use cookie files to improve site functionality and personalisation. By continuing to use HUKD, you accept our cookie and privacy policy.
Get the HUKD app free at Google Play

What happens in a car crash?

SunTzu Avatar
7y, 5m agoPosted 7 years, 5 months ago
Scientists have found that a car accident is typically over before were even consciously aware of it happening.

This is a reconstruction of a crash involving a stationary modern car being struck in the drivers door by another vehicle travelling at 30 mph.

0 milliseconds - An external object touches the drivers door.

1 ms - The cars door pressure sensor detects a pressure wave.

2 ms - An acceleration sensor in the C-pillar behind the rear door also detects a crash event.

2.5 ms - A sensor in the cars centre detects crash vibrations.

5 ms - Cars crash computer checks for insignificant crash events, such as a shopping trolley impact or incidental contact. It is still working out the severity of the crash. Door intrusion structure begins to absorb energy.

6.5 ms - Door pressure sensor registers peak pressures.

7 ms - Crash computer confirms a serious crash and calculates its actions.

8 ms - Computer sends a fire signal to side airbag. Meanwhile, B-pillar begins to crumple inwards and energy begins to transfer into cross-car load path beneath the occupant.

8.5 ms - Side airbag system fires.

15 ms - Roof begins to absorb part of the impact. Airbag bursts through seat foam and begins to fill.

17 ms - Cross-car load path and structure under rear seat reach maximum load.
Airbag covers occupants chest and begins to push the shoulder away from impact zone.

20 ms - Door and B-pillar begin to push on front seat. Airbag begins to push occupants chest away from the impact.

27 ms - Impact velocity has halved from 30mph to 15mph. A pusher block in the seat moves occupants pelvis away from impact zone. Airbag starts controlled deflation.

30 ms - The car has absorbed all crash energy. Airbag remains in place. For a brief moment, occupant experiences maximum force equal to 12 times the force of gravity.

45 ms - Occupant and airbag move together with deforming side structure.

50 ms - Crash computer unlocks cars doors. Passenger safety cell begins to rebound, pushing doors away from occupant.

70 ms - Airbag continues to deflate. Occupant moves back towards middle of car.
Engineers classify crash as complete.

150-300 ms - Occupant becomes aware of collision.

Mind Hacks corroborates these conclusions, stating that the start of concious awareness is typically found to be around 200-300 ms.
SunTzu Avatar
7y, 5m agoPosted 7 years, 5 months ago

All Comments

(5) Jump to unreadPost a comment
lol ... so it takes 0.3s for all this to happen and it took me 5 mins to read it :w00t:
400ms Trouser department computer carries out "system flush".
1 minute later the woman driver screems
what if your car doesn't have all these sensors, is the crash over even quicker?
400ms Trouser department computer carries out "system flush".

i did that laughing

Post a Comment

You don't need an account to leave a comment. Just enter your email address. We'll keep it private.

...OR log in with your social account

...OR comment using your social account

Thanks for your comment! Keep it up!
We just need to have a quick look and it will be live soon.
The community is happy to hear your opinion! Keep contributing!