Re: This should be one of the easiest taxes to collect ...
The highest reduction _WOULD_ be from tachygraphs - because we've already had a huge reduction in DUIs (the only people who do it now either do so unintentionally or are the hardcore who've been doing it for years and believe they'll never be caught - the latter being almost entirely a rural phenomenon in most countries.)
In any case, what you're arguing for is the removal of human driver entirely (robots don't get tired, don't get distracted by the cute ass on the girl walking by or the kids in the back fighting, don't get tunnel vision and don't miss one hazard whilst concentrating on another.)
Biting the hand that feeds IT
