Car manufacturers are extremely careful about the failure modes of components and sensors they put in their vehicles. Consider the design of the CAN bus, which has explicit support for failed and misbehaving peers.
I have yet to see these sorts of considerations in any V2V communication system. The idea that my car might act on (or propagate) incorrect/sabotaged information that it receives from a "peer" is a terrifying form of fragility.
This sort of failure mode needs to be studied and addressed directly before any of these systems are deployed.
It should also be assumed that these new patterns of information propagation will create a huge financial incentive for people to sell after market modifications that exploit the trust models of these protocols.
I have yet to see these sorts of considerations in any V2V communication system. The idea that my car might act on (or propagate) incorrect/sabotaged information that it receives from a "peer" is a terrifying form of fragility.
This sort of failure mode needs to be studied and addressed directly before any of these systems are deployed.
It should also be assumed that these new patterns of information propagation will create a huge financial incentive for people to sell after market modifications that exploit the trust models of these protocols.