interesting thing about those tire treads,, we often call them "gators"
they are from new
tires not recaps. there is a very low recap failure rate on comercial truck
tires, most of what you see are trailer tires that went flat and the driver can't feel it. they heat up and
fall apart.
some areas you will see a lot of them,,,other places you never see them. it mostly reflectsthe amount of truck traffic on a given road.