Hundreds of studies on it here: https://scholar.google.com/scholar?q=traffic+variance+from+average+speed&btnG=&hl=en&as_sdt=0,44.So where's the hard core data for their statements @ 1:35? Were making laws now because of "chance"? Was this video produced by Al Gore productions?
Don't cloak this as a "safety" issue, it's a revenue maker. You know it, just admit it...
It's not only a safety issue...it's also a "don't be a dick" issue...but it's also a safety issue...all on top of it being a legal issue.