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I like this. Would every highway, road, and street need to have a sign every so many miles/blocks?

Also add costs of pollution and health costs for accidents.

I know Oregon does this to an extent; I have seen signs located next to state highway projects "Your tax dollars at work.".

These signs rarely state how much the project costs, though. They just say it was part of such and such tax. At least the ones I have seen.

Yeah, the actual cost is what I am interested in as well as how much was paid for via taxes.