Speed limits are usually too low. Often they have nothing to do with engineering or safety considerations, but are primarily revenue-oriented. If the advent of autonomous vehicles forces regulators to listen to the engineers for a change, that will be an unalloyed Good Thing.
-- 55% of drivers regularly exceed the speed limit, meaning that the speed limit represents the 45th percentile speed
-- driving between the 50th and 90th percentile speeds is the safest
Taken together, driving at the speed limit is significantly unsafe.
You have to remember that many people on here probably don't own a car, or necessarily even hold a driver's license. They most likely either live at home or at school, or take a bus to work (NTTAWWT).
Why not lower it to 5 MPH on a nationwide basis? Think of all the lives that would save!
It shouldn’t go over the speed limit, and under no circumstances should it take the liberty drivers usually take of being within 10% above the limit.
I hope no one wrote it that way.