You correctly identified the HPs of IL, OH, KY, ND, NE, and CA as having had restrictions. Additionally, the HPs of AK, WA, ME, AL, GA, WI, RI, and VT have access restrictions. Some of these restrictions are simply nighttime closures or closing a road in winter, but others are more significant. The HPs of KS and IA are privately owned and near homes, so although I don't know of any formal restrictions, I suspect the landowners wouldn't appreciate any 3 a.m. HP visits. This list may not be exhaustive - just the few that I know about.