This is often repeated, yet despite the studies on speed differentials being dangerous I am still skeptical of the more specific claim that driving the speed limit specifically when others are speeding increases your risk of getting in an accident.
It's likely often repeated because if you try driving 55 in a 55mph zone where people are driving between 62-70, it'sterrifying, it feels like you're stopped. Whether the stat is true or not remains to be seen, but intuitively, it makes a lot of sense. Sure, your risk of rear ending someone at that point is probably negligible, but the odds of being rear ended? Hard to say