I can't see anyone building a separate set of lanes for automated cars. The whole purpose of this is to get automated and nonautomated cars to play nicely with each other. The world can't afford to build another set of roads just for automated vehicles.

Most of the work will be in upgrading road infrastructure to assist in the control of the automated vehicles. Adding things like Vehicle to Vehicle [[V2V) and Vehicle to infrastructure [[V2X) communications using 5g and WIFI to the traffic lights. This will allow adding functions such as platooning vehicles so they move as a block. This increases traffic lane throughput by reducing the spacing needed between vehicles. It would allow a central station to move cars out of the way for high priority vehicles such as police and fire.

There are international standards being developed for all this stuff.