You got it Austin, the RallyCar (formerly Rally America) National Rally Championship.
Mebbe I was splitting hairs on this one a bit, but the RallyCar US Rallycross series runs 4 cars at a time on a track like European rallycross.
This is from this years Olympus Rally, which was a part of WRC at one time, and in fact this rally was the last rally Group B ran in the WRC. I would have posted a pic of Block or Pastrana, but that would have really given it away.
FerrariMan, that is a separate series sanctioned by the USRC.