Tesla has released yet another preview video of its upcoming Model S electric sedan. This time,, a trio of camouflaged Alpha sedans have a go at a track to collect data for the Beta sedan, which is the next step in the Model S' development. Normally one of the coolest parts of checking out a track testing video is hearing the roar of the engine, but the Model S is all electric and all silent, so you'll have to make due with the sound of wooshing wind and tires on tarmac.
Oddly, aside from a single banked turn, this test track looks suspiciously like a public road in the middle of nowhere--I don't know many tracks with bi-directional traffic--but we'll take Tesla's word that it is. (Editors' note: Turns out that the track is part of Tesla's facilities at the former Toyota/NUMMI plant in Fremont, Calif.) Check out the video below to see the Tesla Model S Alpha in action: