Unlike ADAS integrated in new cars, the whole idea of V2V is that the communication system could be retrofitted into existing cars, without waiting for the whole population to replace their cars with new models.
In its report, NHTSA defines an OEM device for V2V as "an electronic device built or integrated into a vehicle during vehicle production." An integrated V2V system, by definition, is "connected to proprietary data busses and can provide highly accurate information using in-vehicle information to generate the Basic Safety Message." The integrated system both broadcasts and receives such basic safety messages. Once integrated into OEMs' vehicle systems, it can offer "haptic warnings" (e.g., tightening the seat belt or vibrating the driver's seat) and audio/visual warnings, according to the report.
Meanwhile, an aftermarket V2V communication device is defined as a device that "provides advisories and warnings to the driver of a vehicle similar to those provided by an OEM-installed V2V device."
Such an after-market device, however, may not be as fully integrated into the vehicle as an OEM device, so it could only connect to a power source, and otherwise would operate independently from systems in the vehicle.
Aftermarket V2V devices can be added to a vehicle at a vehicle dealership, as well as by authorized dealers or installers of automotive equipment.
Interestingly, the NHTSA report even predicts that some aftermarket V2V devices could be your smartphone with apps. They are "portable and can be standalone units carried by the operator, the passenger, or pedestrians."
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