An extreme and interesting concept of transportation is this called gyroscope transport.
According to Wikipedia, "a gyroscope is a spinning wheel or disc in which the axis of rotation is free to assume any orientation by itself. When rotating, the orientation of this axis is unaffected by tilting or rotation of the mounting, according to the conservation of angular momentum."
The idea is to elevate an all platform enough to be able to circulate amongst other vehicles, without interfering with normal traffic.
If that is going to work, that is something we have to wait and see... Maybe there is someone willing to invest. Who knows? Remember though, that the idea of an elevated bus was already implemented in china but without success.