From the updates:
The gate for "Urban Streets" should finish up at 8" wide, with a 5" wide swing arm. This will allow you to completely block one of the street sections. I have also asked for a 2" wide wall section so you can add them to the sidewalks and use a roadway as a choke-point. The spotlight in the picture will be an optional piece and I hope to offer a variety of goodies for the top of the gate walls.