private streets: I am trying to remove driveways that were included in the TIGER data. They are not named, and they typically are rural driveways and farm roads, often blocked with gates or NO TRESPASSING signs. I would not want my driveway included on a public map unless there were good reasons.

New developments seem to have a lot of "private" roads, mostly tiny cul-de-sacs, and I leave those in.

I was able to import aerials from the county (which, although IANAL, I cannot read anything that tells me I can't use them for OpenMap) into GPS utility (see Bone Killian's link above), trace the streets and upload a GPX. Thanks for the pointers.