That probably works well in Denmark, but I think it would be confusing with the morass of federal/state/local governments in the US. A deduction on your Federa

That probably works well in Denmark, but I think it would be confusing with the morass of federal/state/local governments in the US. A deduction on your Federal taxes wouldn't necessarily affect the tax money collected by the local or state government, which is usually the one responsible for building various roads. State and local governments may or may not even collect income taxes (some do, some don't).