What are the reasons for ETC not being detected?

[LeGia]

ETC not being detected can be due to the following reasons: 1. The electronic tag is not properly inserted; 2. Unauthorized removal of the vehicle's electronic tag will render it unusable; 3. The vehicle's windshield is covered with a metal explosion-proof film; 4. OBU transfer or replacement requires visiting a service outlet. ETC operates through dedicated short-range communication between the vehicle's electronic tag installed on the windshield and the microwave antenna on the ETC lane at toll stations. It utilizes computer networking technology to conduct background settlement processing with banks, achieving the purpose of allowing vehicles to pass through highway or bridge toll stations without stopping to pay fees.