The concept that will allow this idea to work is to Keep it LIGHT! Think lightweight. Think long, graceful, soaring, airy, length and strength. If your vision is concrete and communist clunky push the reset button and start over. Most important would be a computer network system. Thru this network each conveyance would communicate with the other, telling its direction, speed, and intentions. If there were conflicts in the use of space, for instance at an intersection, each vehicle could control each other's speed so that each stream of traffic could interlace its self thru the other without stopping or contact.