So I've noticed these small black cameras with solar panels on the side of the road recently in north Polk County. There is one on NW 66th just west of the Des Moines river on the north side of the road, and then I saw one in Ankeny on NW State St by the sports complex and Goldfinch Sports. Anyone know what they are? I figure they can't be speed cameras because I think those require signs now. I was thinking either traffic monitoring of some sort or license plate trackers.