Jack (
@IveBeenJack ) has a great video on the Piston Peak Cars rides.
Important point is that it's modeled after national parks, like Yosemite (on which Piston Peak from Planes is modeled). National parks keep the wildness of "the natural fontier." Tho, one wouldn't find off road racing in a national park since that goes against the purpose of national parks....
Maybe it's more a Chester and Hester thing in the untamed West!!
He also has much higher definition concept art that shows the land and the ride paths better (and water features!!).