Now that more new cars are equipped with ADAS, the NHTSA plan, unveiled this week, to require V2V communications technologies in all new passenger cars might seem too little, too late.
Examples of crash scenarios and vehicle-to-vehicle applications.
In its report, NHTSA laid out several examples of crash scenarios in which V2V communications technology could be applied. The chart above shows, from top to bottom, Rear-End Collision scenarios (forward collision warning, emergency electronic brake warning), Lane Change scenarios (blind spot warning, do not pass warning) and Intersection scenarios (blind intersection warning).
Of the above, the agency identified three V2V safety applications that V2V alone can enable, and no other current, known vehicle-resident sensor- or camera-based systems can replicate. They are: Intersection Movement Assist; Left Turn Assist; and Emergency Electronic Brake Light.
Of particular note is the example of the V2V Intersection Movement Assist Warning scenario as shown below:
In this scenario, the truck and sports utility vehicle are at risk of colliding because the drivers can’t see each other approaching the intersection and the stop sign is disabled. Both drivers would receive warnings of a potential collision, allowing them to take action to avoid it.
The agency acknowledges that two other scenarios, specifically, Forward Collision Warning and Blind Spot Warning + Lane Change Warning, are already available in production vehicles using vehicle-resident sensors.
In defense of V2V, the agency's report makes it clear that V2V communications "offers an operational range of up to 300 meters between vehicles to facilitate identification of intersecting paths that may potentially result in a crash if no driver or vehicle action is taken."
Moreover, the agency adds, a V2V system is "not subject to the same weather, light, or cleanliness constraints associated with vehicle-resident sensors (e.g., cameras, lidar)."
However, it also notes that V2V has its own limitations, as its wireless-based communication technology is subject to issues such as urban canyons and GPS signals.
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