I think folk give the average speeder too much credit.
Those few that might go to the trouble to inquire, use a radar & laser detector, etc. are usually much more attentive than the average driver...and likely less at risk for an accident.
Back when I used a radar detector and drove at speeds safe for the conditions rather than what was posted on the silly signs, my mind was much more focused on driving. Now, when I have no worries about being pulled over to pay the ad-hoc road use tax, my mind is usually on other things, with the minimum number of cycles spent on driving.