Not true.

Mine on the headlamp since Day 1 and some RFID readers couldn't pick it up. Examples include Sunway and Putrajaya tolls.

I guess the placing of the reader is vital. Even the Rawang (S) exit also same problem. Slow detection until need to reverse out.

EFKON, the maker of Smart tag readers already said many times that RFID used here is of passive type and not suitable for high speed scanning. Too bad no one listens to them.