Even with the many advances in medicine and in particular skeletomuscular medicine, Whiplash is still not that well understood. Severity of injury varies considerably between people in the same types of car accidents, even when circumstances are similar. Speed is a major factor, as is the weight of the vehicles. There are several other factors involved. When the person sees the accident coming, the injury is often less severe. This may be because the nervous system has time to prepare.

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