At least, the threat doesn't affect traffic safety. In addition to the communication threats, the prometheus environment is exposed to other threats, which are outside the scope of pro-com. Protection against masquerading. The prometheus environment places special requirement on this service. The identity of a vehicle is in many instances not relevant, but instead the relative position of a vehicle.
Examples are the pro-net services niii and nv.
Protection against unauthorized access. Protection against radio channel jamming. A vehicle can transmit incorrect, potentially malicious, information if its equipment isn't functioning properly. Therefore, introducing the first two security services above will not guarantee correct information to the traffic safety related prometheus services. That is, the security services are of limited value in this context.