You are correct that these issues need to be addressed, the FAA already has a system in place to prevent aerial collisions of commercial and private planes. I'm

You are correct that these issues need to be addressed, the FAA already has a system in place to prevent aerial collisions of commercial and private planes. I'm sure the existing regulations can be modified to be more suitable for uavs and city-scale flight patterns. For example, stay at odd-hundred elevation for north and east travel and stay at even-hundred for south and west travel.