There is no reason to believe that every car on the road will simultaneously be automated when it is much more likely that the transition will be gradual. Rely

There is no reason to believe that every car on the road will simultaneously be automated when it is much more likely that the transition will be gradual. Relying on computer networks built on mesh technology, or using transponders embedded in the environment limits the reach and universal nature of the vehicle. These technologies should be augmentations of a Google car like scanning system, though hopefully using a scaled up commercial technology to reduce the cost of the scanners. Existing cars with land departure do so without requiring that every lane on every road have a radio transmitter.