here cans have a 5cent deposit but if you walked the ditches all day I think maybe $20-30 the first day only though because the refresh rate would be a week maybe less or more but maybe some mufflers and odds and ends as well. realistically though walking the ditch would not be productive but I am not saying you should not do it but more for trash than money and if you adopt a highway you get your name on a shinny sign and roaming gangs of the highway homeless could in fact prove to be useful after all by helping you clean up trash for the cans so you do not have to do it yourself however they would require shelter in the drainage culverts so you must provide weather reports and flood warnings but also could sell them flood insurance and bail money insurance lol