Follow the wind, esp the prevailing wind for the area. (In the wide open areas, that's usually west-to-east most of the day, although sometimes opposite in the morning.

Follow the wind and look for buildings, bushes, mesh or barbed wire fences, logs, rocks, old abandoned vehicles. The wind will blow many things until it finds something that will hold it: plastic bags (usually rotted by UV), paper, bandanas and other cloth items, plastic bottles, cans, kindling, fishing line, baseball caps. I've never seen any shopes, but I did find a knit cap once.

One time on I-5, I saw (in order), a baseball cap, a windbreaker, a long-sleeved plaid shirt, a pair of chinos, a t-shirt, a pair of shoes, a pair of socks, and striped jockey shorts. A whole outfit just for the picking up!

Sue