It would be completely impossible out here to have signs at every road... There are such huge networks of roads in the gas fields, and checkerboards of tribal and private property. You are also completely responsible to know if you are riding/hunting/whatever on private property or not, so it's not really so different in that respect. My friend got hassled while riding a horse in a bar ditch beside a road - the county road is "US Property", but the Utes lay claim to the bar ditch. I think he would have taken her horse away and made her walk home if he'd had a trailer. :) I also agree about being careful during hunting season, and be aware that tribal land is usually heavily patrolled during hunting season. BTW, OP, y'outta come up North and ride in Farmington or Durango with some of us.