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While it might make the in-car problem simpler, but it vastly increases the amount of work required for the task. A whole virtual infrastructure needs to be built on top of the road network! [businessinsider.com...]
Consider the scale of infrastructure that would be required to roll it out (punny) as well as the ongoing maintenance costs due to an ever-changing environment.
Where's the point of balance between cost versus practical use? Who will pick up the municipal cost tab to make it a reality? Hint: probably not the corporations.