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I agree with those who say the briefer you are the better. You want to make it realistic, you need to keep it short. A paragraph, maybe two (for me 1 is enough), imo. An accident is an action scene...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/31357 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I agree with those who say the briefer you are the better. You want to make it realistic, you need to keep it short. A paragraph, maybe two (for me 1 is enough), imo. An accident is an action scene and action scenes are fast moving with short, choppy sentences. If it's a flashback, then it can be slightly longer. As one pointed out the senses of smells and sounds are important. Also, don't forget the feelings of the MC, his thoughts in that split second. The accident might be part of your story but it's not the real plot, it might just lead to the real plot.