You can read a passive RFID from about 30 meters with the right equipment.

"Right equipment" is probably very load bearing. Wouls need a very high gain directional antenna, not sure if a camera next to the road has the space to pick this up from a moving car.

	▲	foxyv 9 hours ago \| parent [-]
		Long distance RFID readers are currently used mostly for warehouse inventory tracking. Nowadays you can steer antennas using phased arrays like they use in 5G. https://www.zebra.com/us/en/products/rfid/rfid-readers.html?... Although, as I understand it, Flock itself is mostly just looking for Bluetooth, BTLE, TPMS Sensors, and Wifi devices.