Ummmm.... first I already paid for the roads, so no additional funding is necessary for road use. Secondly, CO2 is only 4% of the Earth's greenhouse gas, with water vapor making up most of the remainder. And, thirdly, such a measure is draconian in nature, big brother-ish, and a free people should fight to the death to avoid a government locating device being affixed to our vehicles. Americans will revolt. And they should revolt if such measures are attempted here.