Worse, road wear goes up with the fourth power of vehicle weight. http://thatmansscope.blogspot.com/2009/10/trucks-and-fourth-power-rule.html http://thatmanssc

Worse, road wear goes up with the fourth power of vehicle weight. http://thatmansscope.blogspot.com/2009/10/trucks-and-fourth-power-rule.html http://thatmansscope.blogspot.com/2009/10/trucks-and-fourth-... Looking at it that way it becomes clear that bikes and cars do effectively zero road wear and that trucks effectively cause all road wear. As a result there should be "commercial" diesel for big trucks and non-commercial diesel for cars, pickups, etc. You can use dye the same way they do with farm diesel which is untaxed. And then charge about an extra dollar per gallon of tax on the commercial diesel which might roughly offset the actual wear these vehicles cause. What that will do is shift a lot of cargo transport from truck to rail (which wouldn't pay the commercial diesel tax) and which is more fuel efficient anyhow. And if the train companies wanted to they could easily run their trains on natural gas; what's a single extra fuel car when you're already pulling 100 cars worth of cargo? I don't know how you'd get legislation like that passed but it would solve a lot of problems by going after the source of said problems. I'd like to see real problem solving, not can-kicking.