A Question I got via PM

[tomdemaine]

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Or the companies who own the roads will be worried about their legal liability so will require your car have a certain low level of pollution output before you can drive on their roads. There are a million and one solutions.

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If you can only think of solutions that involve enforcement of extremely expansive concepts of vicarious liability, then you're really not proposing anything less unjust than government regulation.

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Yes it is because it's voluntary. Also that isn't the only possible solution it's one of many. Back to the status quo is the worst case scenario.