Did I just waste $13.95?

[Yellow Jacket]

Originally Posted by bobzinger

I think the wires in the pavement sense a change in inductance when metal is over them.

Bobzinger is correct. The wire grids in the pavement are inductive loops, not capacitative as I stated in an earlier post. Therefore they sense a change in inductance not capacitance.

Of course, if you're not into electrical engineering, you probably don't care.