In all seriousness, on some days yes. Once or twice a year the state has inmates who come along and pick up trash and bag it. I've spent a fair amount of time along the side of the interstate, and there is a surprising amount of metal, even large pieces. Around here, it takes them a few days to get the trucks to come pick up the trash bags, so I don't know of any reason why you couldn't just stop, take a quick look, then keep moving to the next one. Same thing with those Adopt A Highway programs. Just keep an eye out for colored bags...