Generally, a SmartTAG device can be mounted to the vehicle windscreen by anyone with ease. It works well when mounted at any location on the windscreen with the optimum location to be at the centre of the windscreen. Hence, no testing is required.
TNG RFID, on the other hand, requires a technician at an authorised Fitment Centre to install it on to the vehicle. Before installing the TNG RFID, the technician has to test the TNG RFID sticker's optimal position for detection, based on the location on either the windscreen or headlamp. When this is confirmed, the TNG RFID sticker will be affixed accordingly and re-tested to ensure the TNG RFID is good for activation. The testing and installation require some level of expertise which only a trained technician can perform.
If the installation and testing were not done properly, the user is likely to encounter problem when passing through the toll lanes. The reader at the toll lanes may fail to detect the TNG RFID and the barrier will not open.
Once the TNG RFID sticker is affixed, it cannot be removed safely. The sticker will break during the attempt to remove it. Hence, it must be tested and affixed correctly at the first time by a trained personnel.