What type of tags, (I mean active, passive, semi-passive...) are used in Australian toll roads?
What I can see from web is most of the tags are passive & being powered with the toll post reader device.
I'm wondering, can they grab enough power to transmit the ID, give a beep within the short time (when passing toll post with 100 km/h or more)?
The RFID used for Road toll collection is usually a UHF chip operating on around 980 Mhz and will be a passive tag but capable of read and write at very high speeds even more than 100Kmph speed of the vehicle.