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Why Don't big citys Answered

Why dont big citiys like Californya use copper undertread in thair roads to let traffic induction charge a current back into there electrical grid?

Dum guy in Alaska. 


That's a cool idea, even though it would be pretty expensive to implement. If you've got a wide open field you could do stuff with, you could probably make a nice test setup and put a design proposal in. <== multi-million dollar idea.


i think the OP was using the "Governator's" phonetic spelling. though, that would require it to be in all caps. "CALIFORNYA"

California is not a city, it's a state (like Alaska, but with more people).

Have you ever dug up a road? Or paid taxes to have someone else do it? Have you ever tried to drive somewhere after a road had been dug up and removed?

Traffic driving over a road won't "induce a current," because the cars are not magnetized.

(You build 1 tonne neodymium magnets into the road)

Why use Nd magnets? Why not build giant coil electromagnets, and power them with the current you collect from induction? You could even use some of that current to make HHO gas to run the cars!

Well, you dig a hole, drop it in with a crane, topcoat-it.
With cables it's a paperwork & planning nightmare, never mind the electrical-stuff....


Do you know how much copper costs tomorrow, and have you worked out where the energy would come from originally (i.e. what makes cars move?).

It's actually a good idea for traffic-control, if you could suck energy out of cars like this you'd reduce speeding because it would get too expensive. And you might possibly cover your costs. But that becomes a form of road-tax, so you'd have to concede other road-taxes.
No, silly idea.


Oooooh, now that's a very cool idea! I wonder if you could design the inductive system with a non-linear response (e.g., a sigmoid or erf). The cars could lose a relatively small (but increasing) amount of energy below the speed limit, then the process would go vaguely exponential a few km/h beyond that, forcing the cars back down to the limit.

Sort of a practical implementation of the Lorentz contraction :-)

You got the concept, that's 1.


or 2 if i include myself


7 years ago

My idea is that any Iron that runs over say a patch of copper,Should cause an electrical flow.
Now if traffic never stops and since your getting back free energy(the people driving have already paid for the gas.)Can the flow be turned into AC ?
Is this a green idea?

That idea is wrong on many levels.

Inductive current is generated by a magnetic field which changes (moves, or increases or decreases) while cutting across a conductor. Steel is not magnetic. You may want to start by reading a basic introduction.

Let's pretend for a moment that you magically turn all cars into giant magnets. You still have to deal with conservation of energy. If the moving car generates a current, it is going to slow down. How much it slows depends on how much of its energy got used to generate the current. Here's an Instructable which demonstrates this.

So, from (2), it's not "free energy." The victims are going to be burning much, much more gas in order to keep moving, than they would if you weren't stealing power from them.