What happens in a car crash?

    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.


    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
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