I think the example of the roads isn't the best example to start with here. If there's any good way to spend taxpayer's money, i think it could be to build and maintain a simple road in the center of a town. And most roads are not made of concrete. At least not where I live. So that bacteria thing might not always be useful.
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Most roads are not made of concrete because concrete eventually cracks and is hard to repair... that problem is now no longer an issue due to this technology. This makes concrete a better alternative to petro based road products. Yes... roads being better designed for more logical use would make sense. There is a great deal of madness when it comes to spending free money taken in taxes(bridges to nowhere). I paved my driveway to have easier and safer access to my home. Businesses will be more inclined to do that to invite customers to their place of business.