HOA's can take ownership of city or county owned streets. The issue is cost. Not only is the HOA then responsible for maintaining the street, but also the stret lights, the water mains, etc, etc.. Since County and City crews no longer have access or responsibility of these area's, they must be done by the HOA. If you look at the HOA fees of gated communities compared with open communities, you will likely see a huge delta. Its a liability that many communities cannot afford.