The NHTSA report devoted a fair amount space to comparing traditional crash warning systems (e.g., radar, lidar, cameras, and combinations of these systems) with V2V communication technology.
The following table illustrates unique characteristics that translate into system advantages and disadvantages.
Collision avoidance sensor summary.
V2V safety systems use messages broadcast by vehicles to enable cooperative crash warning applications. Compared to sensors, V2V systems offer a clear advantage for field-of-view and range, the NHTSA concludes. The NHTSA believes V2V is superior because it can detect and warn of threats from any direction using a single GPS sensor and DSRC communication.
The report, however, points out concerns over basic safety-message congestion issues.
Current research has shown that V2V safety applications perform reliably in test scenarios with up to 200 vehicles in communication range. However, research conducted by the NHTSA and others has yet to estimate "the number of other DSRC-equipped vehicles that a single DSRC radio would need to be exposed to in an environment (such as heavy freeway traffic) where channel congestion would be significant."
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