Ivanpah race track
It consists of a race track, a start/finish banner, a wrecked Flea, and an ant hill. A line of giant soldier ants and giant worker ants will be first encountered moving between the ant mound and the corpse of a giant radscorpion lying on the road west of the Nipton Road pit stop. There is a duffle bag close to the start/finish flag. It is by some rocks on the outer circle.
Ivanpah race track appears only in Fallout: New Vegas.