For a given road and conditions, it’s not how fast you drive, it’s how much faster (or slower) you drive relative to the rest of traffic.
Of course, if you are on a road by yourself with no other traffic, then at a certain point too high of a speed will kill you because you’ll run off of the road. But since most of us drive on roads with other traffic, it’s the relative speed that is most important.
Below are some excerpts from various studies to support this basic fact (from a Dec 2 2000 posting in the Yahoo Groups forum for “Corbin Sparrow Electric Vehicle Driver’s”).