Originally Posted by
Shimagnolo
The drawback is that RFID can only respond to a query with an announcement that it is present, (with its hardcoded ID), but cannot tell where it is. As opposed to ADS-B Out which can provide its exact GPS coordinates. Of course ADS-B would require a power source in order to constantly process its GPS location. I'm not sure telling the AV's onboard computer that "there is a cyclist somewhere" would be of any help.
I work with industrial manufacturing and there are companies working with RFID to get the same information (location, speed, direction). This would be a more controlled environment than our roadways, but this info is available with RFID