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Sure, you can put down hundreds of km worth of piezos on various highways. You
still have to capture the energy, shuttle it to a useful collection station
(copper isn't THAT cheap now), condition it (which very likely means storing
it), and then do something with it. Suppose they got 2000 W-hr over the course
of a day (big assumption on my part). Scaling it to hundreds of km of roads
gives perhaps 70 GJ, which is about how much a SINGLE typical automobile used
per year in the year 2000. That's assuming 100% efficiency at every step, the
ability to feed it all into the energy grid, and whatever other generous
assumptions I've made.