As your design task and wall feed, some information not clear yet, So I would like to propose the "Ring idea" to expect some comment for me to clear these point:
1. Building function: could have service apartment, motel for passer & driver, kindergarten, clinic,...
2. The general requirement of coverage, isolation bell from high way.
3. Main requirement to go sustainable, green top roof or not, photo voltage cell or not,...
4. Range of residential lot size, or put them at good location as much as possible.
5. Clarify of maintain existing elements consist of building and roads or demolish as the new design.
Some strong point such as:
-Low density, buildings crossing by green pedestrian and open ground floor of buildings
-Each residential in an individual ring for more privacy
-Continuous circulation, avoid of dead end road and boring car turning.
-Green and landscape along road is part of open space for reduce noise and also cartouche the street together with distributed the fresh air to whole area to the goal is no air conditioning.
-I am strongly recommend have a Hotel & service apartment in the middle of site as landmark building at 10-12 floors, retail & shop, restaurant in the podium, so land mark building also become the social-core of the township. As you wish, the basic need not further than 300 m.
-Motel and restaurant, fast food, car service, petrol station along the high way for passer, drivers,..
-Warehouse with big & solid roof located in the inside portion of the site with green bell for noise isolation. These roof are excellent place for install the photo voltage cell for electricity.
Weak point is:
Ring road attract vehicle passing than dead end road in client's master plan.
Curve road more cost than straight road, technical for road surface & infrastructure also more difficult than straight road.
It suitable if have public electric car system to travel within internal streets, to avoid of noise, dust & carbon emission.