I made a design for a 48x48 studs baseplate in Excel and will use 4 baseplates in total to make a 'U' shaped road, with parkinglots on the inside.. The Dark Bluish Grey road is wide enough. Along it, you can find the parking lots, and the middle section could contain lampposts, parkingmeters, trees, benches, garbagebins and so on as well! This road should cover the light bluish grey 48x192 area that is still empty! Here some pictures!