With the new autonomous cars to coexist with every other vehicle, the Department of Transportation and NHTSA wants all of our vehicles to 'talk with each other'. New legislation are being planned to make (V2V) vehicle-to-vehicle
communication mandatory in the new class of vehicles and future requirements for interconnectivity with every vehicle on the road. The FCC is testing to ensure the wireless 5.9 GHz spectrum set aside for this connected universe.
The constant communication is not only for on-road dynamics, accident avoidance and navigation but also to be part of a larger constellation to control the most efficient traffic flow dynamics.
...talking about a juicy hack target and libertarians, clutch your pearls.
A Dialogue with Industry, a Conversation between Cars | Department of Transportation