The Tesla semi truck is reported to have recently “driven across the country alone” as proof of what the electric, autonomous big rig can already do.

The traveling Tesla semi truck was first spotted in St. Louis, Missouri visiting Anheuser-Busch, who has already ordered 40 Tesla semi trucks. The truck was later seen stopped on the side of the road in Oklahoma, was then spotted in both Texas and California, and was most recently seen at J.B. Hunt in Arkansas on Friday, August 24th, reported Electrek.

Though it is not clear exactly why the Tesla semi truck has been spotted in so many different locations across the country, Elon Musk recently tweeted out a post claiming that the truck was “driven across the country alone… using the existing Tesla Supercharger network.” This means that, according to Musk, the Tesla semi truck is already able to drive across the country with only an observing driver and no escort cars, all without a finished Supercharger network, let alone the proposed Megacharger stations.

Witnesses who have seen the brand new Tesla semi trucks charging say that the Supercharger station systems are currently made up of extensions cords that plug into several of the supercharger stalls at the same time, as well as several charging ports on the truck.

As of Monday, August 27th there was still no word on when the Tesla semi truck will go into production.