This might be:
https://www.elonroad.com/Just caught it on BBC Click! which is usually careful in what it shows - stuff is likely in prototype but has a fair chance of actually going somewhere.
The Elronroad prototype uses conductive pickup, so it's like the third rail on a railway. That's 650V smack in the middle of the road open to air - I can feel Dave's
BUSTED video coming on now
But it ain't like that. The way it works is they have three pickups under the car, and the track is in sections so the three pickups will always be in two sections. Sections alternate power and return, so you have a proper circuit using only a single track. Camera under the car keeps everything lined up as it goes along.
Safety-wise, the car talks to the track and only those sections under the car are turned on, so the live part follows the car and there is no danger (baring cockups) to someone or something touching the track unless they crawl under the car.
Video showed a section of road (not sure if it was a test track or what, but seemed to be one lane of a normal dual-carriageway) and a Tesla (of course) doing the biz along it.
The section is probably on iPlayer if you're in the UK. If not I'm sure you'll have no problem trashing it based on personal assumptions rather than the actualite.