[jyl]

Not sure what to do about protecting posts C and D from an errant car. A big bollard isn't going to be very DIY for me. I am thinking about multiple posts there, the first ones being non-structural and essentially sacrificial. Or I could set post C in the planted strip, where it is protected by the "curb" separating strip from driveway. Similar for post D, there is a curb around the adjacent planter (brown patch in the pic). Gets into lot line issues though, maybe I need to research exactly where the boundary is. My neighbor won't care but the next owner of his house might.