It doesn't work in theory. Nor does it work in practice. It's been tested, and unless your receiver coil is aligned within a few cm of the sender coil, laterally and height, the transfer efficiency is pathetically low.
Slow moving traffic just won't work. Stationary traffic might, if you can stop exactly on the sweet spot. Since all vehicles are not the same length, if everyone tries to stop over a coil traffic will spread out and reduce road capacity even lower than it already is.
Physics is a bitch sometimes.