When two friendly riders met on the trail, they stopped and sooner or later swung off their horses, squatted on their bootheels, began scratching in the dirt with broomweed stalks.
It moves down Interstate 20 in a 20-car- and-camper caravan and into the still brown land of broomweed and tumbleweed, thorn trees and mesquite and prickly-pear cactus.