I'm covered in dust. My hands are gritty, my hair has silt in it and my camera lenses are caked in the stuff. I've been touring Circuit of the Americas on a breezy March morning to see how Austin's racetrack is shaping up since I last visited in October.

It's been a particularly long five months for the track, riddled with controversy, doubt, speculation and delays.

But at the site on this day, those issues are nowhere to be found. It's full steam ahead at the sprawling site, which has been undergoing work around the clock since construction resumed in early December.